[1.20.1] Does this mod overwrite core shaders?

[Quadruplay]

I'm working on a modpack that uses embeddium and I'm trying to use core shaders, but whatever i do, nothing happens. Could embeddium be at fault? If so, where should I mixin?

I'm trying to disable affine texture mapping in favor of linear (for blocks only) and snap vertices to a screen space grid. I'd use oculus, but it breaks some twilight forest stuff.

[Quadruplay]

yeah, just confirmed it with a fresh install, core shaders just don't work. is there like a replacement for com.mojang.blaze3d.shaders.Program.compileShader embeddium implements? or some other namespace core shaders should go?