Same. Have tried without success: 1) Restarting the phone 2) Signing out and back in to the developer app 3) Toggling iCloud access for the developer app off and back on 4) Restarted again...

Hopefully this helps someone diagnose - tested via Xcode 12.0 beta 2 and iOS 14.0 public beta: SwiftUI views NOT wrapped in NavigationView hide the status bar correctly via ".statusBar(hidden: true)" modifier. SwiftUI views wrapped in NavigationView do not process the status bar correctly via ".statusBar(hidden: true)" modifier. Not seeing much of a difference yet regarding portrait vs landscape. Worked correctly at least through 13.5 but current 13.x. Cheers.