When held in F5 mode, honey and slime blocks, as well as stained glass appears fully lit up in the dark. This isn't an issue in 1.16.5.
Screenshots show comparison between 1.16.5 and 21w11a. This does only happen with graphics set to Fabulous!
Banners are unimpacted by light levels
Slime blocks, honey blocks, stained glass, and ice are fully lit when moved by pistons
String is not affected by light levels