Changing the blockshape of some blocks might cause blocks to become dark and ignore light on 3/4 graphics modes.

Sometimes changing the block shape of some blocks might make them ignore the light.

Simple/Fancy: blocks become extremely dark, like entities when suffocate in the wall.
Vibrnat visuals: blocks ignore the light, but reloading chunks by opening settings makes them look normal for a moment.

Ray tracing isn’t affected (first screenshot)