I believe there are two version of Xcode 12 beta. One for iOS apps and one for Universal mac OS apps. Later they will be combined into one Xcode 12 beta, so perhaps you need to try the Universal macOS Xcode 12 beta.
Post
Replies
Boosts
Views
Activity
It looks like Xcode 16 beta 5 has fixed this issue, at least for me after testing with one app today.