Just to update:

@Talvkes made a good point that it may just be a broken mod, so I went into singleplayer, ran /seed, and then provided that to SeedRay. It highlights incorrect blocks. So I can confirm that it's an issue with the mod, at least in 1.21

this is what a horse look like with shaders on, in some angle however i can see it well

nvm fixed.

2024-07-04_10.40.33.png

Send an email to [email protected] with the username you donated with, your current username, and the email you used when donating

ok, thanks

There are more conflicting mods. Looks like Connector is throwing the error though. I would guarantee there are more