When I was trying to craft some Dark Oak Signs using the recipe book, I noticed that the item previews for the alternate patterns were invisible. On previous versions, it showed item previews so you knew which you were crafting.
- Load version 21w10a
- Search "sign" in recipe book.
- Right click sign to check alternate patterns
- Observe that item previews are missing.
- Load version 21w08b or lower
- Do steps 2-3 again
- Observe that item previews are showing.