The bug
The blocks in the inventory are not lit enough on their top, in comparison with 1.14.4.
This can sometimes lead to confusion of blocks, especially in terms of colors (accessibility).
Examples
Here are (only) a few obvious examples:
- The grass block:
1.14.4:
1.15: 
- The leaves:
1.14.4:
1.15: 
- The banners:
1.14.4:
1.15: 
- duplicates
-
MC-167245 Blocks in the inventory are shaded differently from before / not lit enough
- Resolved