Looks like iOS 17.1 and 17.2 don't fix the issue either :-(
gerritm
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I also have the same problem with iOS 17. I have a TextField bound to an ObservedObject. If you then enter a comma (in Germany), the system deletes it again. Sometimes you can't edit the value itself. Strangely enough, sometimes it works all of a sudden, but usually it doesn't work.