I have my modification build on Fabriс version 1.21.1 on which I need to use the litematica mod and the In-Game Account Switcher mod. But I ran into the problem that these two mods don't allow access to the servers when they work together and the game just crashes.

Post the crash log.

I decided to try logging into the server again now to copy the crash log, but for some reason everything is working now. Probably because I recently installed MiniHUD. I don't know.