From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 11 Dec 2022 23:47:22 -0800
Subject: [PATCH] Fix inconsistencies in dispense events regarding stack size

The javadocs for BlockDispenseEvent suggest the ItemStack is a single
item which is being dispensed. Before this fix, sometimes it was the whole
stack before a single item had been taken. This fixes that so the stack size
is always 1.

diff --git a/src/main/java/net/minecraft/core/dispenser/AbstractProjectileDispenseBehavior.java b/src/main/java/net/minecraft/core/dispenser/AbstractProjectileDispenseBehavior.java
index 2542cf94ac76871f4ff02c3524e8606c96f50cc7..309ad5a1da6b3a297d5526cd9247359ac5f49406 100644
--- a/src/main/java/net/minecraft/core/dispenser/AbstractProjectileDispenseBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/AbstractProjectileDispenseBehavior.java
@@ -28,7 +28,7 @@ public abstract class AbstractProjectileDispenseBehavior extends DefaultDispense
 
         // CraftBukkit start
         // iprojectile.shoot((double) enumdirection.getStepX(), (double) ((float) enumdirection.getStepY() + 0.1F), (double) enumdirection.getStepZ(), this.getPower(), this.getUncertainty());
-        ItemStack itemstack1 = stack.split(1);
+        ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
         org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
         CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -38,12 +38,13 @@ public abstract class AbstractProjectileDispenseBehavior extends DefaultDispense
         }
 
         if (event.isCancelled()) {
-            stack.grow(1);
+            // stack.grow(1); // Paper - shrink below
             return stack;
         }
 
+        boolean shrink = true; // Paper
         if (!event.getItem().equals(craftItem)) {
-            stack.grow(1);
+            shrink = false; // Paper - shrink below
             // Chain to handler for new item
             ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
             DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -57,7 +58,7 @@ public abstract class AbstractProjectileDispenseBehavior extends DefaultDispense
         ((Entity) iprojectile).projectileSource = new org.bukkit.craftbukkit.projectiles.CraftBlockProjectileSource((DispenserBlockEntity) pointer.getEntity());
         // CraftBukkit end
         worldserver.addFreshEntity(iprojectile);
-        // itemstack.shrink(1); // CraftBukkit - Handled during event processing
+        if (shrink) stack.shrink(1); // Paper - actually handle here
         return stack;
     }
 
diff --git a/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java
index eb55015f4c867fbf08430288744f58a3b9d86e89..958134519befadc27a5b647caf64acf272ee2db4 100644
--- a/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java
@@ -53,7 +53,7 @@ public class BoatDispenseItemBehavior extends DefaultDispenseItemBehavior {
 
         // EntityBoat entityboat = new EntityBoat(worldserver, d0, d1 + d3, d2);
         // CraftBukkit start
-        ItemStack itemstack1 = stack.split(1);
+        ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink at end and single item in event
         org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
         CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -63,12 +63,13 @@ public class BoatDispenseItemBehavior extends DefaultDispenseItemBehavior {
         }
 
         if (event.isCancelled()) {
-            stack.grow(1);
+            // stack.grow(1); // Paper - shrink below
             return stack;
         }
 
+        boolean shrink = true; // Paper
         if (!event.getItem().equals(craftItem)) {
-            stack.grow(1);
+            shrink = false; // Paper - shrink below
             // Chain to handler for new item
             ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
             DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -83,8 +84,7 @@ public class BoatDispenseItemBehavior extends DefaultDispenseItemBehavior {
 
         ((Boat) object).setVariant(this.type);
         ((Boat) object).setYRot(enumdirection.toYRot());
-        if (!worldserver.addFreshEntity((Entity) object)) stack.grow(1); // CraftBukkit
-        // itemstack.shrink(1); // CraftBukkit - handled during event processing
+        if (worldserver.addFreshEntity((Entity) object) && shrink) stack.shrink(1); // Paper - if entity add was successful and supposed to shrink
         return stack;
     }
 
diff --git a/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
index 7ebe73921d197da4f992ddb92cbd4ac7211bd6cf..58fa7b99dc7a9745afe6faf31c1804e95ed27dbe 100644
--- a/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
@@ -216,7 +216,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 ServerLevel worldserver = pointer.getLevel();
-                ItemStack itemstack1 = stack.split(1);
+                ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
                 org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -226,12 +226,13 @@ public interface DispenseItemBehavior {
                 }
 
                 if (event.isCancelled()) {
-                    stack.grow(1);
+                    // stack.grow(1); // Paper - shrink below
                     return stack;
                 }
 
+                boolean shrink = true; // Paper
                 if (!event.getItem().equals(craftItem)) {
-                    stack.grow(1);
+                    shrink = false; // Paper - shrink below
                     // Chain to handler for new item
                     ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                     DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -248,7 +249,7 @@ public interface DispenseItemBehavior {
                     return ItemStack.EMPTY;
                 }
 
-                // itemstack.shrink(1); // Handled during event processing
+                if (shrink) stack.shrink(1); // Paper - actually handle here
                 // CraftBukkit end
                 pointer.getLevel().gameEvent((Entity) null, GameEvent.ENTITY_PLACE, pointer.getPos());
                 return stack;
@@ -270,7 +271,7 @@ public interface DispenseItemBehavior {
                 ServerLevel worldserver = pointer.getLevel();
 
                 // CraftBukkit start
-                ItemStack itemstack1 = stack.split(1);
+                ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
                 org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -280,12 +281,13 @@ public interface DispenseItemBehavior {
                 }
 
                 if (event.isCancelled()) {
-                    stack.grow(1);
+                    // stack.grow(1); // Paper - shrink below
                     return stack;
                 }
 
+                boolean shrink = true; // Paper
                 if (!event.getItem().equals(craftItem)) {
-                    stack.grow(1);
+                    shrink = false; // Paper - shrink below
                     // Chain to handler for new item
                     ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                     DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -301,7 +303,7 @@ public interface DispenseItemBehavior {
                 EntityType.updateCustomEntityTag(worldserver, (Player) null, entityarmorstand, stack.getTag());
                 entityarmorstand.setYRot(enumdirection.toYRot());
                 worldserver.addFreshEntity(entityarmorstand);
-                // itemstack.shrink(1); // CraftBukkit - Handled during event processing
+                if (shrink) stack.shrink(1); // Paper - actually handle here
                 return stack;
             }
         });
@@ -321,7 +323,7 @@ public interface DispenseItemBehavior {
 
                 if (!list.isEmpty()) {
                     // CraftBukkit start
-                    ItemStack itemstack1 = stack.split(1);
+                    ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
                     Level world = pointer.getLevel();
                     org.bukkit.block.Block block = world.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
                     CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
@@ -332,12 +334,13 @@ public interface DispenseItemBehavior {
                     }
 
                     if (event.isCancelled()) {
-                        stack.grow(1);
+                        // stack.grow(1); // Paper - shrink below
                         return stack;
                     }
 
+                    boolean shrink = true; // Paper
                     if (!event.getItem().equals(craftItem)) {
-                        stack.grow(1);
+                        shrink = false; // Paper - shrink below
                         // Chain to handler for new item
                         ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                         DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -348,7 +351,7 @@ public interface DispenseItemBehavior {
                     }
                     // CraftBukkit end
                     ((Saddleable) list.get(0)).equipSaddle(SoundSource.BLOCKS, CraftItemStack.asNMSCopy(event.getItem())); // Paper - Fix saddles losing nbt data - MC-191591
-                    // itemstack.shrink(1); // CraftBukkit - handled above
+                    if (shrink) stack.shrink(1); // Paper - actually handle here
                     this.setSuccess(true);
                     return stack;
                 } else {
@@ -376,7 +379,7 @@ public interface DispenseItemBehavior {
                 } while (!entityhorseabstract.isArmor(stack) || entityhorseabstract.isWearingArmor() || !entityhorseabstract.isTamed());
 
                 // CraftBukkit start
-                ItemStack itemstack1 = stack.split(1);
+                ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
                 Level world = pointer.getLevel();
                 org.bukkit.block.Block block = world.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
@@ -387,12 +390,13 @@ public interface DispenseItemBehavior {
                 }
 
                 if (event.isCancelled()) {
-                    stack.grow(1);
+                    // stack.grow(1); // Paper - shrink below
                     return stack;
                 }
 
+                boolean shrink = true; // Paper
                 if (!event.getItem().equals(craftItem)) {
-                    stack.grow(1);
+                    shrink = false; // Paper - shrink below
                     // Chain to handler for new item
                     ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                     DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -402,6 +406,7 @@ public interface DispenseItemBehavior {
                     }
                 }
 
+                if (shrink) stack.shrink(1); // Paper - shrink here
                 entityhorseabstract.getSlot(401).set(CraftItemStack.asNMSCopy(event.getItem()));
                 // CraftBukkit end
                 this.setSuccess(true);
@@ -448,7 +453,7 @@ public interface DispenseItemBehavior {
                     entityhorsechestedabstract = (AbstractChestedHorse) iterator1.next();
                     // CraftBukkit start
                 } while (!entityhorsechestedabstract.isTamed());
-                ItemStack itemstack1 = stack.split(1);
+                ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below
                 Level world = pointer.getLevel();
                 org.bukkit.block.Block block = world.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
@@ -459,10 +464,13 @@ public interface DispenseItemBehavior {
                 }
 
                 if (event.isCancelled()) {
+                    // stack.grow(1); // Paper - shrink below (this was actually missing and should be here, added it commented out just for less confusion)
                     return stack;
                 }
 
+                boolean shrink = true; // Paper
                 if (!event.getItem().equals(craftItem)) {
+                    shrink = false; // Paper - shrink below (this was actually missing and should be here, added it commented out just for less confusion)
                     // Chain to handler for new item
                     ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                     DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -474,7 +482,7 @@ public interface DispenseItemBehavior {
                 entityhorsechestedabstract.getSlot(499).set(CraftItemStack.asNMSCopy(event.getItem()));
                 // CraftBukkit end
 
-                // itemstack.shrink(1); // CraftBukkit - handled above
+                if (shrink) stack.shrink(1); // Paper - actually handle here
                 this.setSuccess(true);
                 return stack;
             }
@@ -485,7 +493,7 @@ public interface DispenseItemBehavior {
                 Direction enumdirection = (Direction) pointer.getBlockState().getValue(DispenserBlock.FACING);
                 // CraftBukkit start
                 ServerLevel worldserver = pointer.getLevel();
-                ItemStack itemstack1 = stack.split(1);
+                ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
                 org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -495,12 +503,13 @@ public interface DispenseItemBehavior {
                 }
 
                 if (event.isCancelled()) {
-                    stack.grow(1);
+                    // stack.grow(1); // Paper - shrink below
                     return stack;
                 }
 
+                boolean shrink = true; // Paper
                 if (!event.getItem().equals(craftItem)) {
-                    stack.grow(1);
+                    shrink = false; // Paper - shrink below
                     // Chain to handler for new item
                     ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                     DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -517,7 +526,7 @@ public interface DispenseItemBehavior {
                 DispenseItemBehavior.setEntityPokingOutOfBlock(pointer, entityfireworks, enumdirection);
                 entityfireworks.shoot((double) enumdirection.getStepX(), (double) enumdirection.getStepY(), (double) enumdirection.getStepZ(), 0.5F, 1.0F);
                 pointer.getLevel().addFreshEntity(entityfireworks);
-                // itemstack.shrink(1); // Handled during event processing
+                if (shrink) stack.shrink(1); // Paper - actually handle here
                 // CraftBukkit end
                 return stack;
             }
@@ -542,7 +551,7 @@ public interface DispenseItemBehavior {
                 double d5 = randomsource.triangle((double) enumdirection.getStepZ(), 0.11485000000000001D);
 
                 // CraftBukkit start
-                ItemStack itemstack1 = stack.split(1);
+                ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
                 org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -552,12 +561,13 @@ public interface DispenseItemBehavior {
                 }
 
                 if (event.isCancelled()) {
-                    stack.grow(1);
+                    // stack.grow(1); // Paper - shrink at end
                     return stack;
                 }
 
+                boolean shrink = true; // Paper
                 if (!event.getItem().equals(craftItem)) {
-                    stack.grow(1);
+                    shrink = false; // Paper - shrink at end
                     // Chain to handler for new item
                     ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                     DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -572,7 +582,7 @@ public interface DispenseItemBehavior {
                 entitysmallfireball.projectileSource = new org.bukkit.craftbukkit.projectiles.CraftBlockProjectileSource((DispenserBlockEntity) pointer.getEntity());
 
                 worldserver.addFreshEntity(entitysmallfireball);
-                // itemstack.shrink(1); // Handled during event processing
+                if (shrink) stack.shrink(1); // Paper - actually handle here
                 // CraftBukkit end
                 return stack;
             }
@@ -615,7 +625,7 @@ public interface DispenseItemBehavior {
                 Material material = iblockdata.getMaterial();
                 if (worldserver.isEmptyBlock(blockposition) || !material.isSolid() || material.isReplaceable() || (dispensiblecontaineritem instanceof BucketItem && iblockdata.getBlock() instanceof LiquidBlockContainer && ((LiquidBlockContainer) iblockdata.getBlock()).canPlaceLiquid(worldserver, blockposition, iblockdata, ((BucketItem) dispensiblecontaineritem).content))) {
                     org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
-                    CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack);
+                    CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack.copyWithCount(1)); // Paper - single item in event
 
                     BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(x, y, z));
                     if (!DispenserBlock.eventFired) {
@@ -688,7 +698,7 @@ public interface DispenseItemBehavior {
 
                         // CraftBukkit start
                         org.bukkit.block.Block bukkitBlock = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
-                        CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack);
+                        CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack.copyWithCount(1)); // Paper - single item in event
 
                         BlockDispenseEvent event = new BlockDispenseEvent(bukkitBlock, craftItem.clone(), new org.bukkit.util.Vector(blockposition.getX(), blockposition.getY(), blockposition.getZ()));
                         if (!DispenserBlock.eventFired) {
@@ -735,7 +745,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 org.bukkit.block.Block bukkitBlock = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
-                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack);
+                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack); // Paper - ignore stack size on damageable items
 
                 BlockDispenseEvent event = new BlockDispenseEvent(bukkitBlock, craftItem.clone(), new org.bukkit.util.Vector(0, 0, 0));
                 if (!DispenserBlock.eventFired) {
@@ -796,7 +806,7 @@ public interface DispenseItemBehavior {
                 BlockPos blockposition = pointer.getPos().relative((Direction) pointer.getBlockState().getValue(DispenserBlock.FACING));
                 // CraftBukkit start
                 org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
-                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack);
+                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack.copyWithCount(1)); // Paper - single item in event
 
                 BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(0, 0, 0));
                 if (!DispenserBlock.eventFired) {
@@ -862,7 +872,7 @@ public interface DispenseItemBehavior {
                 // CraftBukkit start
                 // EntityTNTPrimed entitytntprimed = new EntityTNTPrimed(worldserver, (double) blockposition.getX() + 0.5D, (double) blockposition.getY(), (double) blockposition.getZ() + 0.5D, (EntityLiving) null);
 
-                ItemStack itemstack1 = stack.split(1);
+                ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink at end and single item in event
                 org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -872,12 +882,13 @@ public interface DispenseItemBehavior {
                 }
 
                 if (event.isCancelled()) {
-                    stack.grow(1);
+                    // stack.grow(1); // Paper - shrink below
                     return stack;
                 }
 
+                boolean shrink = true; // Paper
                 if (!event.getItem().equals(craftItem)) {
-                    stack.grow(1);
+                    shrink = false; // Paper - shrink below
                     // Chain to handler for new item
                     ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                     DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -893,7 +904,7 @@ public interface DispenseItemBehavior {
                 worldserver.addFreshEntity(entitytntprimed);
                 worldserver.playSound((Player) null, entitytntprimed.getX(), entitytntprimed.getY(), entitytntprimed.getZ(), SoundEvents.TNT_PRIMED, SoundSource.BLOCKS, 1.0F, 1.0F);
                 worldserver.gameEvent((Entity) null, GameEvent.ENTITY_PLACE, blockposition);
-                // itemstack.shrink(1); // CraftBukkit - handled above
+                if (shrink) stack.shrink(1); // Paper - actually handle here
                 return stack;
             }
         });
@@ -920,7 +931,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 org.bukkit.block.Block bukkitBlock = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
-                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack);
+                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack.copyWithCount(1)); // Paper - single item in event
 
                 BlockDispenseEvent event = new BlockDispenseEvent(bukkitBlock, craftItem.clone(), new org.bukkit.util.Vector(blockposition.getX(), blockposition.getY(), blockposition.getZ()));
                 if (!DispenserBlock.eventFired) {
@@ -969,7 +980,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 org.bukkit.block.Block bukkitBlock = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
-                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack);
+                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack.copyWithCount(1)); // Paper - single item in event
 
                 BlockDispenseEvent event = new BlockDispenseEvent(bukkitBlock, craftItem.clone(), new org.bukkit.util.Vector(blockposition.getX(), blockposition.getY(), blockposition.getZ()));
                 if (!DispenserBlock.eventFired) {
@@ -1042,7 +1053,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 org.bukkit.block.Block bukkitBlock = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
-                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack);
+                CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack.copyWithCount(1)); // Paper - only single item in event
 
                 BlockDispenseEvent event = new BlockDispenseEvent(bukkitBlock, craftItem.clone(), new org.bukkit.util.Vector(blockposition.getX(), blockposition.getY(), blockposition.getZ()));
                 if (!DispenserBlock.eventFired) {
diff --git a/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
index 2366d411bf64f88c7296e888cd3bf584825ae4a9..d1127d93a85a837933d0d73c24cacac4adc3a5b9 100644
--- a/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
@@ -37,7 +37,7 @@ public class ShearsDispenseItemBehavior extends OptionalDispenseItemBehavior {
         ServerLevel worldserver = pointer.getLevel();
         // CraftBukkit start
         org.bukkit.block.Block bukkitBlock = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
-        CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack);
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack); // Paper - ignore stack size on damageable items
 
         BlockDispenseEvent event = new BlockDispenseEvent(bukkitBlock, craftItem.clone(), new org.bukkit.util.Vector(0, 0, 0));
         if (!DispenserBlock.eventFired) {
diff --git a/src/main/java/net/minecraft/core/dispenser/ShulkerBoxDispenseBehavior.java b/src/main/java/net/minecraft/core/dispenser/ShulkerBoxDispenseBehavior.java
index 38b5d8f7b66f5130dbd126957a4a1e59ec543e4a..0159ed9cbc644c39fa79e62327f13375193fdc98 100644
--- a/src/main/java/net/minecraft/core/dispenser/ShulkerBoxDispenseBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/ShulkerBoxDispenseBehavior.java
@@ -34,7 +34,7 @@ public class ShulkerBoxDispenseBehavior extends OptionalDispenseItemBehavior {
 
             // CraftBukkit start
             org.bukkit.block.Block bukkitBlock = pointer.getLevel().getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
-            CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack);
+            CraftItemStack craftItem = CraftItemStack.asCraftMirror(stack.copyWithCount(1)); // Paper - single item in event
 
             BlockDispenseEvent event = new BlockDispenseEvent(bukkitBlock, craftItem.clone(), new org.bukkit.util.Vector(blockposition.getX(), blockposition.getY(), blockposition.getZ()));
             if (!DispenserBlock.eventFired) {
diff --git a/src/main/java/net/minecraft/world/item/ArmorItem.java b/src/main/java/net/minecraft/world/item/ArmorItem.java
index baa7e055d8ee4a153842128b07984b9f6deac6ca..9c8604376228c02f8bbd9a15673fbdf5097e7cb2 100644
--- a/src/main/java/net/minecraft/world/item/ArmorItem.java
+++ b/src/main/java/net/minecraft/world/item/ArmorItem.java
@@ -56,7 +56,7 @@ public class ArmorItem extends Item implements Wearable {
         } else {
             LivingEntity entityliving = (LivingEntity) list.get(0);
             EquipmentSlot enumitemslot = Mob.getEquipmentSlotForItem(armor);
-            ItemStack itemstack1 = armor.split(1);
+            ItemStack itemstack1 = armor.copyWithCount(1); // Paper - shrink below and single item in event
             // CraftBukkit start
             Level world = pointer.getLevel();
             org.bukkit.block.Block block = world.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
@@ -68,12 +68,13 @@ public class ArmorItem extends Item implements Wearable {
             }
 
             if (event.isCancelled()) {
-                armor.grow(1);
+                // armor.grow(1); // Paper - shrink below
                 return false;
             }
 
+            boolean shrink = true; // Paper
             if (!event.getItem().equals(craftItem)) {
-                armor.grow(1);
+                shrink = false; // Paper - shrink below
                 // Chain to handler for new item
                 ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                 DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -90,6 +91,7 @@ public class ArmorItem extends Item implements Wearable {
                 ((Mob) entityliving).setPersistenceRequired();
             }
 
+            if (shrink) armor.shrink(1); // Paper
             return true;
         }
     }
diff --git a/src/main/java/net/minecraft/world/item/MinecartItem.java b/src/main/java/net/minecraft/world/item/MinecartItem.java
index 127a799f7848b32664b77bf67847ca6b8ac9a90d..c6d2f764efa9b8bec730bbe757d480e365b25ccc 100644
--- a/src/main/java/net/minecraft/world/item/MinecartItem.java
+++ b/src/main/java/net/minecraft/world/item/MinecartItem.java
@@ -62,7 +62,7 @@ public class MinecartItem extends Item {
 
             // CraftBukkit start
             // EntityMinecartAbstract entityminecartabstract = EntityMinecartAbstract.createMinecart(worldserver, d0, d1 + d3, d2, ((ItemMinecart) itemstack.getItem()).type);
-            ItemStack itemstack1 = stack.split(1);
+            ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
             org.bukkit.block.Block block2 = worldserver.getWorld().getBlockAt(pointer.getPos().getX(), pointer.getPos().getY(), pointer.getPos().getZ());
             CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -72,12 +72,13 @@ public class MinecartItem extends Item {
             }
 
             if (event.isCancelled()) {
-                stack.grow(1);
+                // stack.grow(1); // Paper - shrink below
                 return stack;
             }
 
+            boolean shrink = true; // Paper
             if (!event.getItem().equals(craftItem)) {
-                stack.grow(1);
+                shrink = false; // Paper - shrink below
                 // Chain to handler for new item
                 ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                 DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
@@ -94,8 +95,7 @@ public class MinecartItem extends Item {
                 entityminecartabstract.setCustomName(stack.getHoverName());
             }
 
-            if (!worldserver.addFreshEntity(entityminecartabstract)) stack.grow(1);
-            // itemstack.shrink(1); // CraftBukkit - handled during event processing
+            if (worldserver.addFreshEntity(entityminecartabstract) && shrink) stack.shrink(1); // Paper - actually handle here
             // CraftBukkit end
             return stack;
         }
