File -> New Project -> iOS -> App
Interface: SwiftUI
Lifecycle: UIKit App Delegate
Language: Swift
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In xcodeproj target, select Mac checkbox
Run app on Mac
Code Block 2020-11-26 21:24:42.940494+0000 Test[85254:1719377] [UIFocus] Focus system disabled 2020-11-26 21:24:43.029918+0000 Test[85254:1719377] [UIFocus] Focus system enabled 2020-11-26 21:24:43.606709+0000 Test[85254:1719377] [UIFocus] Focus system disabled
In my actual app, I get a lot more of these - certain interactions like opening a popover can trigger them. If the last message was Focus system enabled, stuff works fine. If the last is Focus system disabled, a load of elements like Toggle and Slider aren't clickable. I couldn't figure out how to get it to end on an enabled state.
I also tested this on my DTK and get the same errors on the 11.1 Big Sur beta with 12.3 Xcode beta.