Description
If you right click on the cooking pot with a bowl on hand, the bowl will disappear

Steps to reproduce:
1- Hold an empty bowl on hand
2- Interact with Cooking Pot, opening the GUI
3- Bowl on hand is now an empty slot

Expected behavior:
Open the Cooking Pot GUI so that I can insert a bowl

Mod list:
FD Version: 0.2.2
Forge Version: 31.2.30

Can confirm it happens on both versions. I'll take a look, together with some code cleanups.

Fixed on commit 4fa0735. It was affecting whichever item was the previous valid container.