As soon as the the renamed blocks are clicked on in the last slot, it takes the level off the user and then puts the items back in the first slot back in their original unnamed state.
This issue only affects Slightly damaged and damaged anvils
Linked issues
duplicates 1
Comments 3
Just tested this in a creative world, works fine on a normal anvil but I am able to reproduce on a slightly damaged and damaged anvil
Works fine for me.