Duplication Glitches anything by Anvil or Grindstone

This bug base on MCPE-64030

you can use Grindstone to duplication tools easily

also can use Anvil to duplication Shulker Box too,and everything that in Shulker Box can be duplication.

 

here is a video sample

https://www.youtube.com/watch?v=lKq9jtUb2EY