Shader Bliss-shader-main commit #482
Underwater shadows aren't rendered correctly below a certain y level, seems to be the level 51.0

Shadows above y 51.0

Shadows below y 51.0

In-game f3 debug overlay

From what i've tested, it seems there's no specific shader setting that can make it start/stop bugging.
I'm currently using the latest version of Distant Horizon mod for Fabric 1.21, but the bug is still present without DH.

this is the lightleak prevention kicking in, i forgot to make it not work under water lol.
i have to zoom the shadowmap up and center it to a block, so the gaps that leak get mostly filled up by shadow. its hacky but better than removing shadows completely