PaperMC/paper-server/nms-patches/net/minecraft/world/inventory/ContainerPlayer.patch

--- a/net/minecraft/world/inventory/ContainerPlayer.java
+++ b/net/minecraft/world/inventory/ContainerPlayer.java
@@ -13,6 +13,12 @@
 import net.minecraft.world.item.crafting.IRecipe;
 import net.minecraft.world.item.enchantment.EnchantmentManager;
 
+// CraftBukkit start
+import net.minecraft.network.chat.IChatBaseComponent;
+import org.bukkit.craftbukkit.inventory.CraftInventoryCrafting;
+import org.bukkit.craftbukkit.inventory.CraftInventoryView;
+// CraftBukkit end
+
 public class ContainerPlayer extends ContainerRecipeBook<InventoryCrafting> {
 
     public static final int CONTAINER_ID = 0;
@@ -34,15 +40,28 @@
     public static final MinecraftKey EMPTY_ARMOR_SLOT_SHIELD = new MinecraftKey("item/empty_armor_slot_shield");
     static final MinecraftKey[] TEXTURE_EMPTY_SLOTS = new MinecraftKey[]{ContainerPlayer.EMPTY_ARMOR_SLOT_BOOTS, ContainerPlayer.EMPTY_ARMOR_SLOT_LEGGINGS, ContainerPlayer.EMPTY_ARMOR_SLOT_CHESTPLATE, ContainerPlayer.EMPTY_ARMOR_SLOT_HELMET};
     private static final EnumItemSlot[] SLOT_IDS = new EnumItemSlot[]{EnumItemSlot.HEAD, EnumItemSlot.CHEST, EnumItemSlot.LEGS, EnumItemSlot.FEET};
-    private final InventoryCrafting craftSlots = new TransientCraftingContainer(this, 2, 2);
-    private final InventoryCraftResult resultSlots = new InventoryCraftResult();
+    // CraftBukkit start
+    private final TransientCraftingContainer craftSlots;
+    private final InventoryCraftResult resultSlots;
+    // CraftBukkit end
     public final boolean active;
     private final EntityHuman owner;
+    // CraftBukkit start
+    private CraftInventoryView bukkitEntity = null;
+    private PlayerInventory player;
+    // CraftBukkit end
 
     public ContainerPlayer(PlayerInventory playerinventory, boolean flag, final EntityHuman entityhuman) {
         super((Containers) null, 0);
         this.active = flag;
         this.owner = entityhuman;
+        // CraftBukkit start
+        this.resultSlots = new InventoryCraftResult(); // CraftBukkit - moved to before InventoryCrafting construction
+        this.craftSlots = new TransientCraftingContainer(this, 2, 2, playerinventory.player); // CraftBukkit - pass player
+        this.craftSlots.resultInventory = this.resultSlots; // CraftBukkit - let InventoryCrafting know about its result slot
+        this.player = playerinventory; // CraftBukkit - save player
+        setTitle(IChatBaseComponent.translatable("container.crafting")); // SPIGOT-4722: Allocate title for player inventory
+        // CraftBukkit end
         this.addSlot(new SlotResult(playerinventory.player, this.craftSlots, this.resultSlots, 0, 154, 28));
 
         int i;
@@ -264,4 +283,17 @@
     public boolean shouldMoveToInventory(int i) {
         return i != this.getResultSlotIndex();
     }
+
+    // CraftBukkit start
+    @Override
+    public CraftInventoryView getBukkitView() {
+        if (bukkitEntity != null) {
+            return bukkitEntity;
+        }
+
+        CraftInventoryCrafting inventory = new CraftInventoryCrafting(this.craftSlots, this.resultSlots);
+        bukkitEntity = new CraftInventoryView(this.player.player.getBukkitEntity(), inventory, this);
+        return bukkitEntity;
+    }
+    // CraftBukkit end
 }