This is apparently due to the new AirPlay functionality. Control Center stops listening to those ports when I turn off “AirPlay Receiver” in the “Sharing” System Preference:
bfad
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
For some reason this doesn't work for me when I switch to the macOS build. [The documentation][link] lists macOS 11 support on the website (and the docs in Xcode list 10.16), but I'm getting an error that my view "has no member 'onOpenURL'".
[link]: https://developer.apple.com/documentation/swiftui/anyview/onopenurl(perform:)