MTmerm

I've been having an issue with forge 1.16.3 where I can't load any single player saves as it just crashes. The only mod I have installed is Optifine 1.16.3. I can still join servers but when I exit out I get another crash. I've seen other people say that lowering your render distance below 16 might work but it hasn't for me and I'm not sure what to do now. Here's the crash report for the single player crashes: https://pastebin.com/5g9sEyW8