I am using your mod with Optifine however the models are coming up as Purple and Black. Would this be an Optifine issue or your mod issue? I have read that Optifine reads textures differently than Vanilla.

Details
Minecraft 1.18.1
Forge 39.0.8
Optfine HD U H4
No texture packs.

Thanks.

That's due to a lack of support of optifine of the forge rendering pipeline. Please report this to optifine directly.

I have found that the BSL Shaders seem fine. Perhaps its the shader pack?

I'm trying BSL Shader now and still seeing the same issue. Can you post what settings you had, resource packs, mods, etc etc?

I have moved away from this pack but using shaders just fine on my new server.

I have found that the textures are initially broken but fix after a restart of the client!