Dupe exploit with crafting

How to reproduce:

(for duping the mineral blocks, like diamond)

1: Rename 1 diamond in anyway

2: get 8 diamonds

3: place renamed diamond in top left slot in inventory

4: place other 8 anywhere else, but not hot bar

 5: go into crafting table, with recipe book enabled

6: right click the diamond block

If you do it correctly, you will have eight diamonds and a diamond block.

NOTE: Will not work with more than eight not renamed diamonds!