Paper/patches/server/0798-Fix-inconsistencies-in-dispense-events-regarding-sta.patch

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/BoatDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java
index 90e1914599b43c8bf813596b3b428d8be3bac1b5..6df0db8b4cdab23494ea34236949ece4989110a3 100644
--- a/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java
@@ -58,7 +58,7 @@ public class BoatDispenseItemBehavior extends DefaultDispenseItemBehavior {
 
         // Object object = this.isChestBoat ? new ChestBoat(worldserver, d1, d2 + d4, d3) : new EntityBoat(worldserver, d1, d2 + d4, d3);
         // 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 = CraftBlock.at(worldserver, pointer.pos());
         CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -68,12 +68,13 @@ 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());
@@ -89,8 +90,7 @@ public class BoatDispenseItemBehavior extends DefaultDispenseItemBehavior {
         EntityType.createDefaultStackConfig(worldserver, stack, (Player) null).accept(object);
         ((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 2bb3d1f0b89ef5b9b1f9f8da1070d21168830645..9507dbbb4b490149b9248c384be5adaccae40c41 100644
--- a/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
@@ -109,7 +109,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 ServerLevel worldserver = pointer.level();
-                ItemStack itemstack1 = stack.split(1);
+                ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
                 org.bukkit.block.Block block = CraftBlock.at(worldserver, pointer.pos());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -119,12 +119,13 @@ 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());
@@ -141,7 +142,7 @@ 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.level().gameEvent((Entity) null, (Holder) GameEvent.ENTITY_PLACE, pointer.pos());
                 return stack;
@@ -163,7 +164,7 @@ public interface DispenseItemBehavior {
                 ServerLevel worldserver = pointer.level();
 
                 // 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 = CraftBlock.at(worldserver, pointer.pos());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -173,12 +174,13 @@ 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());
@@ -195,7 +197,7 @@ public interface DispenseItemBehavior {
                 ArmorStand entityarmorstand = (ArmorStand) EntityType.ARMOR_STAND.spawn(worldserver, consumer, blockposition, MobSpawnType.DISPENSER, false, false);
 
                 if (entityarmorstand != null) {
-                    // itemstack.shrink(1); // CraftBukkit - Handled during event processing
+                    if (shrink) stack.shrink(1); // Paper - actually handle here
                 }
 
                 return stack;
@@ -215,7 +217,7 @@ 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
                     ServerLevel world = pointer.level();
                     org.bukkit.block.Block block = CraftBlock.at(world, pointer.pos());
                     CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
@@ -226,12 +228,13 @@ 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());
@@ -242,7 +245,7 @@ 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 {
@@ -270,7 +273,7 @@ public interface DispenseItemBehavior {
                 } while (!entityhorseabstract.isBodyArmorItem(stack) || entityhorseabstract.isWearingBodyArmor() || !entityhorseabstract.isTamed());
 
                 // CraftBukkit start
-                ItemStack itemstack1 = stack.split(1);
+                ItemStack itemstack1 = stack.copyWithCount(1); // Paper - shrink below and single item in event
                 ServerLevel world = pointer.level();
                 org.bukkit.block.Block block = CraftBlock.at(world, pointer.pos());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
@@ -281,12 +284,13 @@ 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());
@@ -296,6 +300,7 @@ public interface DispenseItemBehavior {
                     }
                 }
 
+                if (shrink) stack.shrink(1); // Paper - shrink here
                 entityhorseabstract.setBodyArmorItem(CraftItemStack.asNMSCopy(event.getItem()));
                 // CraftBukkit end
                 this.setSuccess(true);
@@ -342,7 +347,7 @@ 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
                 ServerLevel world = pointer.level();
                 org.bukkit.block.Block block = CraftBlock.at(world, pointer.pos());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
@@ -353,10 +358,13 @@ public interface DispenseItemBehavior {
                 }
 
                 if (event.isCancelled()) {
+                    // stack.grow(1); // Paper - shrink below (this was actually missing and should be here, added it commented out to be consistent)
                     return stack;
                 }
 
+                boolean shrink = true; // Paper
                 if (!event.getItem().equals(craftItem)) {
+                    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());
@@ -368,7 +376,7 @@ 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;
             }
@@ -413,7 +421,7 @@ public interface DispenseItemBehavior {
                 if (willEmptyContentsSolidBucketItem || willEmptyBucketItem) {
                 // Paper end - correctly check if the bucket place will succeed
                     org.bukkit.block.Block block = CraftBlock.at(worldserver, pointer.pos());
-                    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) {
@@ -486,7 +494,7 @@ public interface DispenseItemBehavior {
 
                         // CraftBukkit start
                         org.bukkit.block.Block bukkitBlock = CraftBlock.at(worldserver, pointer.pos());
-                        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) {
@@ -533,7 +541,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 org.bukkit.block.Block bukkitBlock = CraftBlock.at(worldserver, pointer.pos());
-                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) {
@@ -596,7 +604,7 @@ public interface DispenseItemBehavior {
                 BlockPos blockposition = pointer.pos().relative((Direction) pointer.state().getValue(DispenserBlock.FACING));
                 // CraftBukkit start
                 org.bukkit.block.Block block = CraftBlock.at(worldserver, pointer.pos());
-                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) {
@@ -662,7 +670,7 @@ 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 = CraftBlock.at(worldserver, pointer.pos());
                 CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -672,12 +680,13 @@ 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());
@@ -693,7 +702,7 @@ 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, (Holder) GameEvent.ENTITY_PLACE, blockposition);
-                // itemstack.shrink(1); // CraftBukkit - handled above
+                if (shrink) stack.shrink(1); // Paper - actually handle here
                 return stack;
             }
         });
@@ -720,7 +729,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 org.bukkit.block.Block bukkitBlock = CraftBlock.at(worldserver, pointer.pos());
-                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) {
@@ -769,7 +778,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 org.bukkit.block.Block bukkitBlock = CraftBlock.at(worldserver, pointer.pos());
-                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) {
@@ -842,7 +851,7 @@ public interface DispenseItemBehavior {
 
                 // CraftBukkit start
                 org.bukkit.block.Block bukkitBlock = CraftBlock.at(worldserver, pointer.pos());
-                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/ProjectileDispenseBehavior.java b/src/main/java/net/minecraft/core/dispenser/ProjectileDispenseBehavior.java
index 1b1c54ce8f187b968352d4aad05821ece182e20b..985954030654d521291cccbfc3ca49b67ee4357d 100644
--- a/src/main/java/net/minecraft/core/dispenser/ProjectileDispenseBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/ProjectileDispenseBehavior.java
@@ -40,7 +40,7 @@ public class ProjectileDispenseBehavior extends DefaultDispenseItemBehavior {
 
         // CraftBukkit start
         // this.projectileItem.shoot(iprojectile, (double) enumdirection.getStepX(), (double) enumdirection.getStepY(), (double) enumdirection.getStepZ(), this.dispenseConfig.power(), this.dispenseConfig.uncertainty());
-        ItemStack itemstack1 = stack.split(1);
+        ItemStack itemstack1 = stack.copyWithCount(1); // Paper
         org.bukkit.block.Block block = CraftBlock.at(worldserver, pointer.pos());
         CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -50,12 +50,13 @@ public class ProjectileDispenseBehavior 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());
@@ -69,7 +70,7 @@ public class ProjectileDispenseBehavior extends DefaultDispenseItemBehavior {
         ((Entity) iprojectile).projectileSource = new org.bukkit.craftbukkit.projectiles.CraftBlockProjectileSource(pointer.blockEntity());
         // 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/ShearsDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
index 4924926327787e7564116e9d6e20d2c2e98b2229..fbed5d57db0c0e79996f85571b9af0071fa953c7 100644
--- a/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
@@ -38,7 +38,7 @@ public class ShearsDispenseItemBehavior extends OptionalDispenseItemBehavior {
         ServerLevel worldserver = pointer.level();
         // CraftBukkit start
         org.bukkit.block.Block bukkitBlock = CraftBlock.at(worldserver, pointer.pos());
-        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 f84987c36a16df19286d6f1badfb1ffb9cc7e770..6f2adf2334e35e8a617a4ced0c1af2abf32bbd8d 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 = CraftBlock.at(pointer.level(), pointer.pos());
-            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 f1cee3266e95094dd1afd501c96e4beaa3d71796..e766397aae3f73548b290b0809b9d1ca0967ea39 100644
--- a/src/main/java/net/minecraft/world/item/ArmorItem.java
+++ b/src/main/java/net/minecraft/world/item/ArmorItem.java
@@ -64,7 +64,7 @@ public class ArmorItem extends Item implements Equipable {
         } 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.level();
             org.bukkit.block.Block block = CraftBlock.at(world, pointer.pos());
@@ -76,12 +76,13 @@ public class ArmorItem extends Item implements Equipable {
             }
 
             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());
@@ -98,6 +99,7 @@ public class ArmorItem extends Item implements Equipable {
                 ((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 727319e86aa77b5a67b4c4f03b1e9aba9fe6bcde..66074445d3908b9bb1c8d70e1e27d057720ec8e5 100644
--- a/src/main/java/net/minecraft/world/item/MinecartItem.java
+++ b/src/main/java/net/minecraft/world/item/MinecartItem.java
@@ -66,7 +66,7 @@ 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 = CraftBlock.at(worldserver, pointer.pos());
             CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
@@ -76,12 +76,13 @@ 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 {
             itemstack1 = CraftItemStack.asNMSCopy(event.getItem());
             AbstractMinecart entityminecartabstract = AbstractMinecart.createMinecart(worldserver, event.getVelocity().getX(), event.getVelocity().getY(), event.getVelocity().getZ(), ((MinecartItem) itemstack1.getItem()).type, itemstack1, (Player) null);
 
-            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;
         }