diff --git a/patches/api/0124-PlayerElytraBoostEvent.patch b/patches/api/0124-PlayerElytraBoostEvent.patch
index 759f0f7047..fb24f9dbbf 100644
--- a/patches/api/0124-PlayerElytraBoostEvent.patch
+++ b/patches/api/0124-PlayerElytraBoostEvent.patch
@@ -6,10 +6,10 @@ Subject: [PATCH] PlayerElytraBoostEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/player/PlayerElytraBoostEvent.java b/src/main/java/com/destroystokyo/paper/event/player/PlayerElytraBoostEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..42375d44ed0db457b96165414e9b45a557bac1ab
+index 0000000000000000000000000000000000000000..9ebac41c22b8866df616020d409e5e1a49cddca5
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/player/PlayerElytraBoostEvent.java
-@@ -0,0 +1,90 @@
+@@ -0,0 +1,104 @@
 +package com.destroystokyo.paper.event.player;
 +
 +import org.bukkit.entity.Firework;
@@ -17,6 +17,7 @@ index 0000000000000000000000000000000000000000..42375d44ed0db457b96165414e9b45a5
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.player.PlayerEvent;
++import org.bukkit.inventory.EquipmentSlot;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
 +import org.jetbrains.annotations.NotNull;
@@ -31,14 +32,17 @@ index 0000000000000000000000000000000000000000..42375d44ed0db457b96165414e9b45a5
 +    @NotNull private final ItemStack itemStack;
 +    @NotNull private final Firework firework;
 +    private boolean consume = true;
++    @NotNull
++    private final EquipmentSlot hand;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public PlayerElytraBoostEvent(@NotNull Player player, @NotNull ItemStack itemStack, @NotNull Firework firework) {
++    public PlayerElytraBoostEvent(@NotNull Player player, @NotNull ItemStack itemStack, @NotNull Firework firework, @NotNull EquipmentSlot hand) {
 +        super(player);
 +        this.itemStack = itemStack;
 +        this.firework = firework;
++        this.hand = hand;
 +    }
 +
 +    /**
@@ -79,6 +83,16 @@ index 0000000000000000000000000000000000000000..42375d44ed0db457b96165414e9b45a5
 +        this.consume = consume;
 +    }
 +
++    /**
++     * Gets the hand holding the firework used for boosting this player.
++     *
++     * @return interaction hand
++     */
++    @NotNull
++    public EquipmentSlot getHand() {
++        return this.hand;
++    }
++
 +    @Override
 +    public boolean isCancelled() {
 +        return this.cancelled;
diff --git a/patches/api/0173-Fix-Spigot-annotation-mistakes.patch b/patches/api/0173-Fix-Spigot-annotation-mistakes.patch
index 8145eed098..1f17f45353 100644
--- a/patches/api/0173-Fix-Spigot-annotation-mistakes.patch
+++ b/patches/api/0173-Fix-Spigot-annotation-mistakes.patch
@@ -982,6 +982,30 @@ index 8f601e85df580ef8106eaff8b9eafb5691a4874b..d615c006c9153fb65024241604b744fb
      public static final MemoryKey<Location> SNIFFER_EXPLORED_POSITIONS = new MemoryKey<>(NamespacedKey.minecraft("sniffer_explored_positions"), Location.class);
  
      /**
+diff --git a/src/main/java/org/bukkit/event/block/BrewingStartEvent.java b/src/main/java/org/bukkit/event/block/BrewingStartEvent.java
+index 9e54ef5b60bf5583c12e1edfa76f19013a5b2a65..37be83184cae203d5e99518b0ff5c708fafb0331 100644
+--- a/src/main/java/org/bukkit/event/block/BrewingStartEvent.java
++++ b/src/main/java/org/bukkit/event/block/BrewingStartEvent.java
+@@ -8,6 +8,7 @@ import org.jetbrains.annotations.NotNull;
+ /**
+  * Called when a brewing stand starts to brew.
+  */
++@org.jetbrains.annotations.ApiStatus.Experimental // Paper
+ public class BrewingStartEvent extends InventoryBlockStartEvent {
+ 
+     private static final HandlerList handlers = new HandlerList();
+diff --git a/src/main/java/org/bukkit/event/block/CampfireStartEvent.java b/src/main/java/org/bukkit/event/block/CampfireStartEvent.java
+index 53119742beda00a38111063243665bb995ae2188..2d084214e991fecc51f8e18e3d733e43b1dca248 100644
+--- a/src/main/java/org/bukkit/event/block/CampfireStartEvent.java
++++ b/src/main/java/org/bukkit/event/block/CampfireStartEvent.java
+@@ -9,6 +9,7 @@ import org.jetbrains.annotations.NotNull;
+ /**
+  * Called when a Campfire starts to cook.
+  */
++@org.jetbrains.annotations.ApiStatus.Experimental // Paper
+ public class CampfireStartEvent extends InventoryBlockStartEvent {
+ 
+     private static final HandlerList handlers = new HandlerList();
 diff --git a/src/main/java/org/bukkit/event/enchantment/PrepareItemEnchantEvent.java b/src/main/java/org/bukkit/event/enchantment/PrepareItemEnchantEvent.java
 index e9a6e5be5f33a342f7e5c496f0f1c64b2f302ace..f0db59a556deaefefbdaca121585c0fd199c13c2 100644
 --- a/src/main/java/org/bukkit/event/enchantment/PrepareItemEnchantEvent.java
diff --git a/patches/api/0401-Fix-HandlerList-for-InventoryBlockStartEvent-subclas.patch b/patches/api/0401-Fix-HandlerList-for-InventoryBlockStartEvent-subclas.patch
index 1ae7f17da6..c375206bf7 100644
--- a/patches/api/0401-Fix-HandlerList-for-InventoryBlockStartEvent-subclas.patch
+++ b/patches/api/0401-Fix-HandlerList-for-InventoryBlockStartEvent-subclas.patch
@@ -5,11 +5,11 @@ Subject: [PATCH] Fix HandlerList for InventoryBlockStartEvent subclasses
 
 
 diff --git a/src/main/java/org/bukkit/event/block/BrewingStartEvent.java b/src/main/java/org/bukkit/event/block/BrewingStartEvent.java
-index 9e54ef5b60bf5583c12e1edfa76f19013a5b2a65..fe6573d8fca0aa8d8f37f8b476fc45adc786795f 100644
+index 37be83184cae203d5e99518b0ff5c708fafb0331..43eac972f45d1cbb6278b048f8e6d7882c0aabeb 100644
 --- a/src/main/java/org/bukkit/event/block/BrewingStartEvent.java
 +++ b/src/main/java/org/bukkit/event/block/BrewingStartEvent.java
-@@ -10,7 +10,7 @@ import org.jetbrains.annotations.NotNull;
-  */
+@@ -11,7 +11,7 @@ import org.jetbrains.annotations.NotNull;
+ @org.jetbrains.annotations.ApiStatus.Experimental // Paper
  public class BrewingStartEvent extends InventoryBlockStartEvent {
  
 -    private static final HandlerList handlers = new HandlerList();
@@ -17,7 +17,7 @@ index 9e54ef5b60bf5583c12e1edfa76f19013a5b2a65..fe6573d8fca0aa8d8f37f8b476fc45ad
      private int brewingTime;
  
      public BrewingStartEvent(@NotNull final Block furnace, @NotNull ItemStack source, int brewingTime) {
-@@ -36,14 +36,5 @@ public class BrewingStartEvent extends InventoryBlockStartEvent {
+@@ -37,14 +37,5 @@ public class BrewingStartEvent extends InventoryBlockStartEvent {
          this.brewingTime = brewTime;
      }
  
@@ -34,11 +34,11 @@ index 9e54ef5b60bf5583c12e1edfa76f19013a5b2a65..fe6573d8fca0aa8d8f37f8b476fc45ad
 +    // Paper - remove HandlerList
  }
 diff --git a/src/main/java/org/bukkit/event/block/CampfireStartEvent.java b/src/main/java/org/bukkit/event/block/CampfireStartEvent.java
-index 53119742beda00a38111063243665bb995ae2188..1f7a8bf65e9ac3188f759f9b3c4d6edbf255942a 100644
+index 2d084214e991fecc51f8e18e3d733e43b1dca248..4b12575107b3f1fa6d0ed7f667bf0d0ae40acae0 100644
 --- a/src/main/java/org/bukkit/event/block/CampfireStartEvent.java
 +++ b/src/main/java/org/bukkit/event/block/CampfireStartEvent.java
-@@ -11,7 +11,7 @@ import org.jetbrains.annotations.NotNull;
-  */
+@@ -12,7 +12,7 @@ import org.jetbrains.annotations.NotNull;
+ @org.jetbrains.annotations.ApiStatus.Experimental // Paper
  public class CampfireStartEvent extends InventoryBlockStartEvent {
  
 -    private static final HandlerList handlers = new HandlerList();
@@ -46,7 +46,7 @@ index 53119742beda00a38111063243665bb995ae2188..1f7a8bf65e9ac3188f759f9b3c4d6edb
      private int cookingTime;
      private CampfireRecipe campfireRecipe;
  
-@@ -49,14 +49,5 @@ public class CampfireStartEvent extends InventoryBlockStartEvent {
+@@ -50,14 +50,5 @@ public class CampfireStartEvent extends InventoryBlockStartEvent {
          this.cookingTime = cookTime;
      }
  
diff --git a/patches/api/0469-Deprecate-ItemStack-setType.patch b/patches/api/0469-Deprecate-ItemStack-setType.patch
new file mode 100644
index 0000000000..78e7c70b9f
--- /dev/null
+++ b/patches/api/0469-Deprecate-ItemStack-setType.patch
@@ -0,0 +1,54 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Thu, 29 Feb 2024 17:54:26 -0500
+Subject: [PATCH] Deprecate ItemStack#setType
+
+
+diff --git a/src/main/java/org/bukkit/inventory/ItemStack.java b/src/main/java/org/bukkit/inventory/ItemStack.java
+index 245a730a54c4b241a9a67eccceefafd2763bd238..7414b4fa690d393a8e9557cc1fd1ce12fa426940 100644
+--- a/src/main/java/org/bukkit/inventory/ItemStack.java
++++ b/src/main/java/org/bukkit/inventory/ItemStack.java
+@@ -134,8 +134,18 @@ public class ItemStack implements Cloneable, ConfigurationSerializable, Translat
+      * {@link Material#isItem()} returns false.</b>
+      *
+      * @param type New type to set the items in this stack to
++     * @deprecated <b>Setting the material type of ItemStacks is no longer supported.</b>
++     * <p>
++     * This method is deprecated due to potential illegal behavior that may occur
++     * during the context of which this ItemStack is being used, allowing for certain item validation to be bypassed.
++     * It is recommended to instead create a new ItemStack object with the desired
++     * Material type, and if possible, set it in the appropriate context.
++     *
++     * Using this method in ItemStacks passed in events will result in undefined behavior.
++     * @see ItemStack#withType(Material)
+      */
+     @Utility
++    @Deprecated // Paper
+     public void setType(@NotNull Material type) {
+         Preconditions.checkArgument(type != null, "Material cannot be null");
+         this.type = type;
+@@ -148,6 +158,24 @@ public class ItemStack implements Cloneable, ConfigurationSerializable, Translat
+             this.data = null;
+         }
+     }
++    // Paper start
++    /**
++     * Creates a new ItemStack with the specified Material type, where the item count and item meta is preserved.
++     *
++     * @param type The Material type of the new ItemStack.
++     * @return A new ItemStack instance with the specified Material type.
++     */
++    @NotNull
++    @org.jetbrains.annotations.Contract(value = "_ -> new", pure = true)
++    public ItemStack withType(@NotNull Material type) {
++        ItemStack itemStack = new ItemStack(type, this.amount);
++        if (this.hasItemMeta()) {
++            itemStack.setItemMeta(this.getItemMeta());
++        }
++
++        return itemStack;
++    }
++    // Paper end
+ 
+     /**
+      * Gets the amount of items in this stack
diff --git a/patches/api/0470-Item-Mutation-Fixes.patch b/patches/api/0470-Item-Mutation-Fixes.patch
new file mode 100644
index 0000000000..c1c3508b78
--- /dev/null
+++ b/patches/api/0470-Item-Mutation-Fixes.patch
@@ -0,0 +1,50 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Wed, 20 Mar 2024 20:42:31 -0400
+Subject: [PATCH] Item Mutation Fixes
+
+
+diff --git a/src/main/java/org/bukkit/event/block/InventoryBlockStartEvent.java b/src/main/java/org/bukkit/event/block/InventoryBlockStartEvent.java
+index f30ed841864f426c59143f392f39c96f864ba924..16fd600c25991e641a1be6fb78238256a6ce3d3f 100644
+--- a/src/main/java/org/bukkit/event/block/InventoryBlockStartEvent.java
++++ b/src/main/java/org/bukkit/event/block/InventoryBlockStartEvent.java
+@@ -21,7 +21,7 @@ import org.jetbrains.annotations.NotNull;
+ public class InventoryBlockStartEvent extends BlockEvent {
+ 
+     private static final HandlerList handlers = new HandlerList();
+-    private final ItemStack source;
++    protected ItemStack source; // Paper
+ 
+     public InventoryBlockStartEvent(@NotNull final Block block, @NotNull ItemStack source) {
+         super(block);
+diff --git a/src/main/java/org/bukkit/event/enchantment/EnchantItemEvent.java b/src/main/java/org/bukkit/event/enchantment/EnchantItemEvent.java
+index 1829529c9915937dcdd0e6d1ceba9e64819fb93f..e7c243038b70ca13b7eabdf88ce518b6198c6db9 100644
+--- a/src/main/java/org/bukkit/event/enchantment/EnchantItemEvent.java
++++ b/src/main/java/org/bukkit/event/enchantment/EnchantItemEvent.java
+@@ -20,7 +20,7 @@ import org.jetbrains.annotations.NotNull;
+ public class EnchantItemEvent extends InventoryEvent implements Cancellable {
+     private static final HandlerList handlers = new HandlerList();
+     private final Block table;
+-    private final ItemStack item;
++    private ItemStack item; // Paper
+     private int level;
+     private boolean cancelled;
+     private final Map<Enchantment, Integer> enchants;
+@@ -72,6 +72,17 @@ public class EnchantItemEvent extends InventoryEvent implements Cancellable {
+         return item;
+     }
+ 
++    // Paper start
++    /**
++     * Sets the item to be enchanted
++     *
++     * @param item item
++     */
++    public void setItem(@NotNull final ItemStack item) {
++        this.item = item;
++    }
++    // Paper end
++
+     /**
+      * Gets the cost (minimum level) which is displayed as a number on the right
+      * hand side of the enchantment offer.
diff --git a/patches/server/0009-MC-Utils.patch b/patches/server/0009-MC-Utils.patch
index 8f3da9d5b8..40721b09a9 100644
--- a/patches/server/0009-MC-Utils.patch
+++ b/patches/server/0009-MC-Utils.patch
@@ -7892,10 +7892,10 @@ index ed501b794c222278dca98f8ece6096db1d8108a5..be3a8e54d64b3cc145ab09b0bc7abb3f
 +    }
  }
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-index bf46aa3bd46ffabe92d58aa45ea0dfe6c98d94aa..23b83f8e98d681895b4e23cda4f3d50f85c12dd9 100644
+index bf46aa3bd46ffabe92d58aa45ea0dfe6c98d94aa..0bb01e53f1c15071c8cd818cce79af8196fe790f 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-@@ -23,6 +23,16 @@ import org.bukkit.material.MaterialData;
+@@ -23,6 +23,20 @@ import org.bukkit.material.MaterialData;
  @DelegateDeserialization(ItemStack.class)
  public final class CraftItemStack extends ItemStack {
  
@@ -7907,6 +7907,10 @@ index bf46aa3bd46ffabe92d58aa45ea0dfe6c98d94aa..23b83f8e98d681895b4e23cda4f3d50f
 +            return asNMSCopy(bukkit);
 +        }
 +    }
++
++    public static net.minecraft.world.item.ItemStack getOrCloneOnMutation(ItemStack old, ItemStack newInstance) {
++        return old == newInstance ? unwrap(old) : asNMSCopy(newInstance);
++    }
 +    // Paper end - MC Utils
 +
      public static net.minecraft.world.item.ItemStack asNMSCopy(ItemStack original) {
diff --git a/patches/server/0067-Handle-Item-Meta-Inconsistencies.patch b/patches/server/0067-Handle-Item-Meta-Inconsistencies.patch
index 9528bf1431..279fb52e31 100644
--- a/patches/server/0067-Handle-Item-Meta-Inconsistencies.patch
+++ b/patches/server/0067-Handle-Item-Meta-Inconsistencies.patch
@@ -70,10 +70,10 @@ index 6291265ae4691bf7dffe196d20571c1c30e8d906..70511628eefc28163d07f50f18d9cc55
  
      public boolean isEnchanted() {
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-index 23b83f8e98d681895b4e23cda4f3d50f85c12dd9..c72a1a503f6e71228a1f82b37068ff7a83e983dc 100644
+index 0bb01e53f1c15071c8cd818cce79af8196fe790f..b59e84bbed37b002a34fe81efdce6f025617fc84 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-@@ -188,28 +188,11 @@ public final class CraftItemStack extends ItemStack {
+@@ -192,28 +192,11 @@ public final class CraftItemStack extends ItemStack {
      public void addUnsafeEnchantment(Enchantment ench, int level) {
          Preconditions.checkArgument(ench != null, "Enchantment cannot be null");
  
@@ -107,7 +107,7 @@ index 23b83f8e98d681895b4e23cda4f3d50f85c12dd9..c72a1a503f6e71228a1f82b37068ff7a
      }
  
      static boolean makeTag(net.minecraft.world.item.ItemStack item) {
-@@ -242,43 +225,15 @@ public final class CraftItemStack extends ItemStack {
+@@ -246,43 +229,15 @@ public final class CraftItemStack extends ItemStack {
      public int removeEnchantment(Enchantment ench) {
          Preconditions.checkArgument(ench != null, "Enchantment cannot be null");
  
@@ -159,7 +159,7 @@ index 23b83f8e98d681895b4e23cda4f3d50f85c12dd9..c72a1a503f6e71228a1f82b37068ff7a
  
          return level;
      }
-@@ -290,7 +245,7 @@ public final class CraftItemStack extends ItemStack {
+@@ -294,7 +249,7 @@ public final class CraftItemStack extends ItemStack {
  
      @Override
      public Map<Enchantment, Integer> getEnchantments() {
diff --git a/patches/server/0193-ItemStack-getMaxItemUseDuration.patch b/patches/server/0193-ItemStack-getMaxItemUseDuration.patch
index 83ab07155e..e66ff94efb 100644
--- a/patches/server/0193-ItemStack-getMaxItemUseDuration.patch
+++ b/patches/server/0193-ItemStack-getMaxItemUseDuration.patch
@@ -6,10 +6,10 @@ Subject: [PATCH] ItemStack#getMaxItemUseDuration
 Allows you to determine how long it takes to use a usable/consumable item
 
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-index c72a1a503f6e71228a1f82b37068ff7a83e983dc..d9a07829d5d0ebcb18b8e3f12622ed7795955d61 100644
+index b59e84bbed37b002a34fe81efdce6f025617fc84..78f2159285e676b877f85df604889ddcf19e8923 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-@@ -184,6 +184,13 @@ public final class CraftItemStack extends ItemStack {
+@@ -188,6 +188,13 @@ public final class CraftItemStack extends ItemStack {
          return (this.handle == null) ? Material.AIR.getMaxStackSize() : this.handle.getItem().getMaxStackSize();
      }
  
diff --git a/patches/server/0214-PlayerElytraBoostEvent.patch b/patches/server/0214-PlayerElytraBoostEvent.patch
index b9afdb2bf1..80552e3b6d 100644
--- a/patches/server/0214-PlayerElytraBoostEvent.patch
+++ b/patches/server/0214-PlayerElytraBoostEvent.patch
@@ -5,7 +5,7 @@ Subject: [PATCH] PlayerElytraBoostEvent
 
 
 diff --git a/src/main/java/net/minecraft/world/item/FireworkRocketItem.java b/src/main/java/net/minecraft/world/item/FireworkRocketItem.java
-index 3749cfca8f007973d1a2206d8f2ba15283a550e1..eb655eb01e4841ca163666f21dae00f0632a11e5 100644
+index 7c627d27300247db9122ab2081049345ef306073..4565cf51ee2f973b368a984436c02220ed9f4a70 100644
 --- a/src/main/java/net/minecraft/world/item/FireworkRocketItem.java
 +++ b/src/main/java/net/minecraft/world/item/FireworkRocketItem.java
 @@ -68,12 +68,19 @@ public class FireworkRocketItem extends Item {
@@ -15,7 +15,7 @@ index 3749cfca8f007973d1a2206d8f2ba15283a550e1..eb655eb01e4841ca163666f21dae00f0
 -                world.addFreshEntity(fireworkRocketEntity);
 -                if (!user.getAbilities().instabuild) {
 +                // Paper start - PlayerElytraBoostEvent
-+                com.destroystokyo.paper.event.player.PlayerElytraBoostEvent event = new com.destroystokyo.paper.event.player.PlayerElytraBoostEvent((org.bukkit.entity.Player) user.getBukkitEntity(), org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemStack), (org.bukkit.entity.Firework) fireworkRocketEntity.getBukkitEntity());
++                com.destroystokyo.paper.event.player.PlayerElytraBoostEvent event = new com.destroystokyo.paper.event.player.PlayerElytraBoostEvent((org.bukkit.entity.Player) user.getBukkitEntity(), org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemStack), (org.bukkit.entity.Firework) fireworkRocketEntity.getBukkitEntity(), org.bukkit.craftbukkit.CraftEquipmentSlot.getHand(hand));
 +                if (event.callEvent() && world.addFreshEntity(fireworkRocketEntity)) {
 +                    user.awardStat(Stats.ITEM_USED.get(this));
 +                    if (event.shouldConsume() && !user.getAbilities().instabuild) {
diff --git a/patches/server/0221-Don-t-call-getItemMeta-on-hasItemMeta.patch b/patches/server/0221-Don-t-call-getItemMeta-on-hasItemMeta.patch
index c597f5c121..939529febe 100644
--- a/patches/server/0221-Don-t-call-getItemMeta-on-hasItemMeta.patch
+++ b/patches/server/0221-Don-t-call-getItemMeta-on-hasItemMeta.patch
@@ -11,10 +11,10 @@ Returns true if getDamage() == 0 or has damage tag or other tag is set.
 Check the `ItemMetaTest#testTaggedButNotMeta` method to see how this method behaves.
 
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-index d9a07829d5d0ebcb18b8e3f12622ed7795955d61..7ce48473222516aefda3c5ad40e5e3fd23502e3d 100644
+index 78f2159285e676b877f85df604889ddcf19e8923..f3195b37c314a1327752ece7ec33dfdae16f0bec 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-@@ -675,7 +675,7 @@ public final class CraftItemStack extends ItemStack {
+@@ -679,7 +679,7 @@ public final class CraftItemStack extends ItemStack {
  
      @Override
      public boolean hasItemMeta() {
diff --git a/patches/server/0716-More-Projectile-API.patch b/patches/server/0716-More-Projectile-API.patch
index 797924f9aa..abcfbb28e9 100644
--- a/patches/server/0716-More-Projectile-API.patch
+++ b/patches/server/0716-More-Projectile-API.patch
@@ -568,10 +568,10 @@ index 7d72ccdd82daa6afe85859f5bc6ec7b187622384..fb0426a1d864f3c60637e394e5bedb39
          }
  
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-index 7ce48473222516aefda3c5ad40e5e3fd23502e3d..6725c0824b986885c8aade846f6e159986ffbe59 100644
+index f3195b37c314a1327752ece7ec33dfdae16f0bec..6b75314023adf313937990e31323dff9bacc564b 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-@@ -294,12 +294,20 @@ public final class CraftItemStack extends ItemStack {
+@@ -298,12 +298,20 @@ public final class CraftItemStack extends ItemStack {
      public ItemMeta getItemMeta() {
          return CraftItemStack.getItemMeta(this.handle);
      }
diff --git a/patches/server/0840-Remove-CraftItemStack-setAmount-null-assignment.patch b/patches/server/0840-Remove-CraftItemStack-setAmount-null-assignment.patch
index 8d4f6df398..0e54130972 100644
--- a/patches/server/0840-Remove-CraftItemStack-setAmount-null-assignment.patch
+++ b/patches/server/0840-Remove-CraftItemStack-setAmount-null-assignment.patch
@@ -16,10 +16,10 @@ with less than zero amounts, so this code doesn't create
 a problem with operations on the vanilla ItemStack.
 
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-index 6725c0824b986885c8aade846f6e159986ffbe59..312e756843f62371048a4d8de9deb024bd9846a7 100644
+index 6b75314023adf313937990e31323dff9bacc564b..fb2e4881096459eff16a7c46faa9921166837ee9 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-@@ -157,7 +157,7 @@ public final class CraftItemStack extends ItemStack {
+@@ -161,7 +161,7 @@ public final class CraftItemStack extends ItemStack {
          }
  
          this.handle.setCount(amount);
diff --git a/patches/server/0886-fix-item-meta-for-tadpole-buckets.patch b/patches/server/0886-fix-item-meta-for-tadpole-buckets.patch
index 7dc82282e5..7ee950152d 100644
--- a/patches/server/0886-fix-item-meta-for-tadpole-buckets.patch
+++ b/patches/server/0886-fix-item-meta-for-tadpole-buckets.patch
@@ -17,10 +17,10 @@ index c421649a0c88ee9c773bb6985f7114e58f08a7a1..71aac5d4cf29cea9daa378fc8ac58475
          case GLOW_ITEM_FRAME:
          case PAINTING:
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-index 312e756843f62371048a4d8de9deb024bd9846a7..a2e605bc1418dc0b5570566a6e348df03c9aee4c 100644
+index fb2e4881096459eff16a7c46faa9921166837ee9..f106db3aa5e5b3b0b8133eff77dbc65c8895ff2e 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-@@ -597,6 +597,7 @@ public final class CraftItemStack extends ItemStack {
+@@ -601,6 +601,7 @@ public final class CraftItemStack extends ItemStack {
              case COD_BUCKET:
              case PUFFERFISH_BUCKET:
              case SALMON_BUCKET:
diff --git a/patches/server/0933-Allow-proper-checking-of-empty-item-stacks.patch b/patches/server/0933-Allow-proper-checking-of-empty-item-stacks.patch
index eefdaefa4b..1ffc2241c3 100644
--- a/patches/server/0933-Allow-proper-checking-of-empty-item-stacks.patch
+++ b/patches/server/0933-Allow-proper-checking-of-empty-item-stacks.patch
@@ -5,10 +5,10 @@ Subject: [PATCH] Allow proper checking of empty item stacks
 
 
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-index a2e605bc1418dc0b5570566a6e348df03c9aee4c..e1f9a603e7adf3468faa9bb6d93dd3339327b47e 100644
+index f106db3aa5e5b3b0b8133eff77dbc65c8895ff2e..38ceeca108c258852eeb7a48015010a689ac43ec 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-@@ -33,12 +33,19 @@ public final class CraftItemStack extends ItemStack {
+@@ -37,12 +37,19 @@ public final class CraftItemStack extends ItemStack {
      }
      // Paper end - MC Utils
  
diff --git a/patches/server/0971-Add-drops-to-shear-events.patch b/patches/server/0971-Add-drops-to-shear-events.patch
index 3d83041ef9..a249a70023 100644
--- a/patches/server/0971-Add-drops-to-shear-events.patch
+++ b/patches/server/0971-Add-drops-to-shear-events.patch
@@ -264,10 +264,10 @@ index 99292a908b36e3c75d51c6877c7a0c01d9671aa6..0a041d0e56dfe1319e5174cb0e6085dc
  
      public static Cancellable handleStatisticsIncrease(net.minecraft.world.entity.player.Player entityHuman, net.minecraft.stats.Stat<?> statistic, int current, int newValue) {
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-index e1f9a603e7adf3468faa9bb6d93dd3339327b47e..870954fc59efdc1e0c6b5047f5a89dfaf7522d0e 100644
+index 38ceeca108c258852eeb7a48015010a689ac43ec..f67b048c3831fcab24acd12249cbd32d386c3ffe 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
-@@ -62,6 +62,16 @@ public final class CraftItemStack extends ItemStack {
+@@ -66,6 +66,16 @@ public final class CraftItemStack extends ItemStack {
          return stack;
      }
  
diff --git a/patches/server/1055-Deprecate-ItemStack-setType.patch b/patches/server/1055-Deprecate-ItemStack-setType.patch
new file mode 100644
index 0000000000..72d51180a3
--- /dev/null
+++ b/patches/server/1055-Deprecate-ItemStack-setType.patch
@@ -0,0 +1,30 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Tue, 26 Mar 2024 21:42:23 -0400
+Subject: [PATCH] Deprecate ItemStack#setType
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+index f67b048c3831fcab24acd12249cbd32d386c3ffe..534d3f02ad14ac246ef947a118c07cca81d600dc 100644
+--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
++++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+@@ -711,4 +711,19 @@ public final class CraftItemStack extends ItemStack {
+     static boolean hasItemMeta(net.minecraft.world.item.ItemStack item) {
+         return !(item == null || item.getTag() == null || item.getTag().isEmpty());
+     }
++    // Paper start - with type
++    @Override
++    public ItemStack withType(final Material type) {
++        if (type == Material.AIR) return CraftItemStack.asCraftMirror(null);
++
++        final net.minecraft.world.item.ItemStack copy = new net.minecraft.world.item.ItemStack(
++            CraftItemType.bukkitToMinecraft(type), this.getAmount()
++        );
++        if (this.handle != null && this.handle.getTag() != null) copy.setTag(this.handle.getTag().copy());
++
++        final CraftItemStack mirrored = CraftItemStack.asCraftMirror(copy);
++        mirrored.setItemMeta(mirrored.getItemMeta());
++        return mirrored;
++    }
++    // Paper end
+ }
diff --git a/patches/server/1056-Item-Mutation-Fixes.patch b/patches/server/1056-Item-Mutation-Fixes.patch
new file mode 100644
index 0000000000..4fc0800e22
--- /dev/null
+++ b/patches/server/1056-Item-Mutation-Fixes.patch
@@ -0,0 +1,49 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Wed, 20 Mar 2024 20:41:35 -0400
+Subject: [PATCH] Item Mutation Fixes
+
+
+diff --git a/src/main/java/net/minecraft/world/inventory/EnchantmentMenu.java b/src/main/java/net/minecraft/world/inventory/EnchantmentMenu.java
+index 343f44db579839eb61376f876b5eff2e615dc2e5..e6935b6632c7a7e07f4da459c95f564356242f98 100644
+--- a/src/main/java/net/minecraft/world/inventory/EnchantmentMenu.java
++++ b/src/main/java/net/minecraft/world/inventory/EnchantmentMenu.java
+@@ -229,7 +229,7 @@ public class EnchantmentMenu extends AbstractContainerMenu {
+                 return false;
+             } else if (this.costs[id] > 0 && !itemstack.isEmpty() && (player.experienceLevel >= j && player.experienceLevel >= this.costs[id] || player.getAbilities().instabuild)) {
+                 this.access.execute((world, blockposition) -> {
+-                    ItemStack itemstack2 = itemstack;
++                    ItemStack itemstack2 = itemstack; // Paper - diff on change
+                     List<EnchantmentInstance> list = this.getEnchantmentList(itemstack, id, this.costs[id]);
+ 
+                     // CraftBukkit start
+@@ -251,11 +251,18 @@ public class EnchantmentMenu extends AbstractContainerMenu {
+                             return;
+                         }
+                         // CraftBukkit end
+-                        boolean flag = itemstack.is(Items.BOOK);
++                        // Paper start
++                        itemstack2 = org.bukkit.craftbukkit.inventory.CraftItemStack.getOrCloneOnMutation(item, event.getItem());
++                        if (itemstack2 != itemstack) {
++                            this.enchantSlots.setItem(0, itemstack2);
++                        }
++                        boolean flag = itemstack2.is(Items.BOOK);
++                        // Paper end
+ 
+                         if (flag) {
++                            CompoundTag nbttagcompound = itemstack2.getTag(); // Paper - move up
+                             itemstack2 = new ItemStack(Items.ENCHANTED_BOOK);
+-                            CompoundTag nbttagcompound = itemstack.getTag();
++                            // Paper - move up
+ 
+                             if (nbttagcompound != null) {
+                                 itemstack2.setTag(nbttagcompound.copy());
+@@ -277,7 +284,7 @@ public class EnchantmentMenu extends AbstractContainerMenu {
+                                     EnchantmentInstance weightedrandomenchant = new EnchantmentInstance(nms, entry.getValue());
+                                     EnchantedBookItem.addEnchantment(itemstack2, weightedrandomenchant);
+                                 } else {
+-                                    item.addUnsafeEnchantment(entry.getKey(), entry.getValue());
++                                    CraftItemStack.asCraftMirror(itemstack2).addUnsafeEnchantment(entry.getKey(), entry.getValue()); // Paper
+                                 }
+                             } catch (IllegalArgumentException e) {
+                                 /* Just swallow invalid enchantments */