I have submitted feedback along with a sample project with code used to load leaderboards on the Watch.
The Feedback number is:
FB11645950
Johnno
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This is still an issue with Xcode 13 beta 3 with Simulator running iOS 15 beta 3.
If I run my SpriteView() code on the Simulator with iOS 14.5 it works fine.
Hopefully this will be fixed in iOS 15 beta 4!