I was using a crafting table and I was crafting something, but the ingredients appeared dark grey, even though I had them in my inventory. I can still craft items. See screenshots
How to reproduce:
- /give @s planks 0 2
- /give @s crafting_table
- /gamemode 0
- Place the crafting table.
- Toggle the recipe book so it is on if it is not.
- Hover over the recipe for a stick with your mouse/cursor.
Expected results: The ingredients all appear in the crafting grid and have the normal background.
Observed results: They have a red background.
Note: Part of this issue I'm describing has been fixed in 1.16.101 (mentioned by @Math Bjbo.)