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

--- a/net/minecraft/world/inventory/ContainerAnvilAbstract.java
+++ b/net/minecraft/world/inventory/ContainerAnvilAbstract.java
@@ -92,6 +92,7 @@
 
     @Override
     public boolean canUse(EntityHuman entityhuman) {
+        if (!this.checkReachable) return true; // CraftBukkit
         return (Boolean) this.access.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);