According to the devs, Mojang changed generation in 1.18 which fully breaks seed cracking. Probably going to be a long time before we see a new method.
The only mod? Malilib is a dependency of Litematica, so make sure you also add that.
If it still occurs, I will need a screenshot of the mods folder, and you can try to delete "me", "EMC", and "net" from libraries and reinstall Aristois.
Shader bugs are to be expected with all clients, as they all modify rendering in one way or another. You can try messing with your video or shader settings to see what works best.