--- a/net/minecraft/world/inventory/ContainerAnvilAbstract.java
+++ b/net/minecraft/world/inventory/ContainerAnvilAbstract.java
@@ -105,6 +105,7 @@
 
     @Override
     public boolean stillValid(EntityHuman entityhuman) {
+        if (!this.checkReachable) return true; // CraftBukkit
         return (Boolean) this.access.evaluate((world, blockposition) -> {
             return !this.isValidBlock(world.getBlockState(blockposition)) ? false : entityhuman.canInteractWithBlock(blockposition, 4.0D);
         }, true);