I ran into the same issue. On watchOS 7 my full screen views started to show the black strip you mentioned.
I was able to fix this by adding the navigationBarHidden modifier to my full screen views. As an example:
MyFullScreenView()
.navigationBarHidden(true)
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Same issue here. Works fine on watchOS 7 but not on the latest watchOS 8 beta. Same code works just fine also on iOS 15 beta.
In my case the Overview part of the Sales and Trends section seems to be the problem. You should be able to access your sales data by using a direct link to your sales chart:
https://appstoreconnect.apple.com/trends/sales?measure=total_tax_usd_utc
Same here and only on watchOS
Same problem here. Same code works on iOS 16 but not on watchOS 9 (tested also on watchOS 9.2)