Okay so let me start off by saying I AM NOT USING SHADERS despite the error saying unkown shader in my modpack that is timing everyone out at random time.

Now players will be playing on our server and out of the blue they time out or get kicked without any error in the server console, But when a client checks their miencraft log you can see error like this: [17:07:33] [Client thread/ERROR] [stellarsky]: Invalid field depthToFogFactor has claimed while loading shaders!

Here is the part of the log stating the entire issue https://pastebin.com/E433Z9dP

And here is my minecraft log: https://pastebin.com/VSpkihQS

I think this has to do with BetterFPS mod removing fog or Dynamic surroundings fog I'm still working on fixing this as I am using it in a modpack to track the days the world has been active but I am really hoping there is a fix for this without removing any mods.