Same here,
2015 MacBook Pro on Big Sur (20A5364e), Xcode Version 12.0 (12A7209), iPhone XR with iOS 14.0.
Running/Debugging works in Simulator but unfortunately not on Hardware. I get a blank screen. If the app is started without Run/Debug it works correctly.
As with postngs answer the app runs correctly after 2-3 minutes in Run/Debug.
rrrruuubyyy
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