BEFORE:

AFTER:

Resource packs enabled:

I am 100% sure that Continuity that cause this issue because I installed the mods I use singorlarly after each startup to find the one that was creating the problem.

(Sodium 0.0.5 + Indium 1.0.22+mc1.20.1)

Duplicate of comp500/Indium#220.

Sorry :P

I noticed that the problem occurs only when applying the built-in resource pack. When you don't enable it, it doesn't create this problem with shadows.