Same for me. I filed a report also
Update: This bug is still happening in 1.19.80
I tried loading without internet, turning it back on and signing out and signing in again, and it crashed. I think the problem is definitely to do with signing in with internet.
Same problem for me. The internet solution worked, and even if you go out of the app it still loads. Marketplace can’t be accessed or realms though. But servers and multiplayer worlds can.
Thankfully this bug was fixed for me, it just seemed to go away after IOS updates and Minecraft updates. I hope it gets resolved for you!
I did notice that the bug didn’t happen on my mums iPad which is the exact same as mine, maybe it’s tailored to each device?