Bug(dup)

Hello, Mojang! I'm just a player of a minecraft. I'm found bug with shulker and anvil. You can dup shulker with one method. You need damaged anvil, full inventory, shulker(with diamonds?). And then you need full your inventory and just re-name shulker until anvil will broke and you got 2 shulker. Mojang fix it please. It's very unbalance for players.