We're also affected by the crash, here's two sample apps that demonstrate it: https://github.com/plu/UITextViewCrash FB16604342 Only happens on iOS 18.4 Beta - any other iOS version before that was fine.

We're running into exactly the same problem and cannot release another update for our app. Would be really great if somebody from Apple could look into this. We've also created a support case with number 102224346553.