After update on Xcode Version 14.3 (14E222b) all functions shouldChangeCharactersIn are called twice. I've checked all sources and even new projects are with the bug

You haven’t given us a lot to go on here. My best guess is that shouldChangeCharactersIn is some sort of delegate method. Is that right? If so, what object is it associated with?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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shouldChangeCharactersIn is delegate method for UITextField and UITextView which is called when user enters or removes anything in the respective fields. I have also observed this wrong behaviour with iOS 17 that its called twice for single entry removal from UITextField and UITextView