Items with full durability can be successfully combined in a crafting bench or grindstone

The player can combine/repair two items that have full durability inside of a crafting bench or grindstone, despite the same not being possible in an anvil.

Steps to Reproduce:

1. Get two new items at full durability
2. Combine them inside of a crafting bench or grindstone
   → The items combine
3. Repeat the previous steps with an anvil instead
   → The items do not combine

Expected Results:

The items would not combine because they are both at full durability, and there is nothing which can, or needs to be repaired. This effectly 'deletes' a completely usable and new item.

Screenshots/Videos:

The anvil:

The Crafting Bench & Grindstone: