Lighting glitches (Item frames turning black, tops of shulker boxes darkening ingame and in creative menu, items being displayed with strange lighting in decoration category)

 

Lighting glitches (Item frames turning black, tops of shulker boxes darkening ingame and in the creative menu, items being displayed with strange lighting in decoration category)

What I expected to happen was...:
Item frames displaying regularly, shulker box(es) being lit properly, menu displaying blocks as they should be ingame

What actually happened was...:

Item frames not displaying regularly, shulker box(es) not being lit properly, menu not displaying blocks as they should be ingame

 

Steps to Reproduce:
1. Unsure if works, but turn smooth lighting from Max to minimum, then back to Max. 

2. If 1st step doesn't work on its own, spawn Wandering trader.