Bottom row copper ingots stay in crafting grid after crafting copper doors or trapdoors

When you craft copper doors or trapdoors, the bottom row copper ingots in the crafting grid stay when crafted

 

Steps to reproduce:

1. Get 6 copper ingots
2. Open the crafting table
3. Craft a copper door or a trapdoor
4. Bottom row copper ingots will stay in crafting grid after being crafted