Internal error while loading shaders

[What42Pizza]

What happened?

I'm a fairly experienced shader dev and I'm trying to edit a shader, but it seems like I'm getting an internal error from Iris whenever I try to load the shader. I'm using 1.8.5+1.21.4-fabric, and I'm not sure if my shader edit is actually valid, but I'm pretty sure Iris is supposed to never react like this

Here's the shader, and it only breaks when entering the end. If you look at the dimensions.properties then you'll notice that I made the end dimension2, but that's just for my own testing shader_that_causes_bug.zip

Screenshots

Log output

Error given by iris: Shader compilation failed for shadowcomp compute shadowcomp!

Minecraft Version

1.21.4

Iris Version

iris-fabric-1.8.5+mc1.21.4.jar

Operating System

windows 10

What is your GPU?

gtx 1070

Additional context

Only breaks in the End

[What42Pizza]

For some more context, I'm trying to make this shader have a customized settings file for a specific new dimension. I'm using the end as a placeholder for this dimension, but I get the same error when in the new dimension. Also, I've just tried to recreate this edit from the ground up, and I'm getting the exact same error as before, so I'm pretty sure there's nothing wrong with the shader itself