I have the problem that in 1.16.1 all items in jei (just enouth iteams) are invisible if I have a shader in there's there any hotfix or a shader that does not have this problem? Btw is not in fabric in forge
You can only use shaders with Optifine or not? And as far as I know, Optifine is not yet available for 1.16.1
But optifine already exists for 1.16.1:
https://minecraftupdate.com/optifine/
There's only that for 1.15