I’m having the same problems. (Or at least, a very similar problem) After downloading the update, I couldn’t access any of my instances. The feed wouldn’t load with a generic error message “Something went wrong”.

After deleting and reinstalling the app via Testflight all my logins were gone. Okay, that was expected. But trying to log in again, I encountered the same error message as in your Github issue across multiple instances. (https://github.com/buresdv/Mlem/issues/188)

I hope a fix can be found for this!!