Iris + fabric shaders with labPBR causes a glitch making the ice be pink in mc java edition v1.21.4

[Bicheka]

I tried everything like uninstalling everything and installing it again and it did not work I tested the same texture packs and the same shaders with OptiFine and it worked perfectly but slower as expected. The glitch only happens when you have a texture pack that uses pbr and you enable the labPBR option in the shader options and Parallax occlusion mapping. In my case I tried using Roundista and Pixilli texture packs with BSL, Sildur's Vibrant Extreme VL, and Complementary shaders. Sometimes you move the camera to certain angles and the glitch goes away and then if you move it again the error comes back. By disabling the labPbr option or by removing the texture pack and using vanilla it also works.

[Linguardium]

This is not a fabric loader issue. Try to reproduce this issue with only fabric loader and no mods and see if the problem persists.

If the problem is with a mod you are using, i suggest seeking help on their discord