I had exactly the same issue. It did not matter where I placed ,,navigationBarHidden(true)'', it would not work. Apparently it is a bug with IOS15. Now that I have IOS16 the issue is gone, without changing any code. I know you posted the question a while ago, but maybe that helps.
Timo_
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Wondering the same thing and the thread below doesn't seem to work. Have you found an answer? -Thank you in advance