My problem is way worse... I have updated Xcode to 15.4 via the App Store. Now nothing works. I can't run on any simulator, old or new. Can't download new simulator with 17.5 (request timed out). Can't run on my own device (iPhone 15 iOS 17.5) Really bad.

I am having the same problem with Preview crashing, but not on all files. However, I actually get a crash screen with OK/Reopen. It's a fairly standard Login screen with AppAuth 1.4.0 from package. Would be thankful for any help as it is painful to run up app in simulator for UI changes.