Paper/paper-server/nms-patches/net/minecraft/world/inventory/ContainerAnvilAbstract.patch

--- a/net/minecraft/world/inventory/ContainerAnvilAbstract.java
+++ b/net/minecraft/world/inventory/ContainerAnvilAbstract.java
@@ -11,13 +11,7 @@
 public abstract class ContainerAnvilAbstract extends Container {
 
     protected final InventoryCraftResult resultInventory = new InventoryCraftResult();
-    protected final IInventory repairInventory = new InventorySubcontainer(2) {
-        @Override
-        public void update() {
-            super.update();
-            ContainerAnvilAbstract.this.a((IInventory) this);
-        }
-    };
+    protected final IInventory repairInventory; // CraftBukkit - instantiate repairInventory in the constructor
     protected final ContainerAccess containerAccess;
     protected final EntityHuman player;
 
@@ -31,6 +25,15 @@
         super(containers, i);
         this.containerAccess = containeraccess;
         this.player = playerinventory.player;
+        // CraftBukkit start
+        this.repairInventory = new InventoryCrafting(this, 1, 2, player) {
+            @Override
+            public void update() {
+                super.update();
+                ContainerAnvilAbstract.this.a((IInventory) this);
+            }
+        };
+        // CraftBukkit end
         this.a(new Slot(this.repairInventory, 0, 27, 47));
         this.a(new Slot(this.repairInventory, 1, 76, 47));
         this.a(new Slot(this.resultInventory, 2, 134, 47) {
@@ -85,6 +88,7 @@
 
     @Override
     public boolean canUse(EntityHuman entityhuman) {
+        if (!this.checkReachable) return true; // CraftBukkit
         return (Boolean) this.containerAccess.a((world, blockposition) -> {
             return !this.a(world.getType(blockposition)) ? false : entityhuman.h((double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D) <= 64.0D;
         }, true);