After analyzing almost line by line the real time game sample given by Apple, I found one little difference, I didn't have the Group Activities entitlement. After adding this, the multiplayer game started working again. Probably this was not a requirement in previous versions, I don't know, but problem solved. I supposed Apple could give a better error message, though.

I'm having the exact same problem and it made me lose a lot of time. I tried using opacity to show/hide the view that I wanted to animate and it worked until I tried to "navigate" to another view and the UI got unresponsive. There is a loop and a possible memory leak happening. It seems I will need to use the timer trick for now.

I thought the same, but it seems that the MapProxy is only useful to convert point into coordinates (plus other conversions). I was hoping to get the current map zoom, orientation, rect, etc... when the user changes the map, but I haven't found any way, yet :(

I haven't use XCTest yet, but probably it's the same problem, maybe you need to pass/set your MOC in another way. I don't think the problem is your PersistentStore or DataManager class.

I have gotten a similar error when in SwiftUI the environment NSManagedObjectContext is unknown. For example in the Previews.

Did you set the parent in the child record?

Private database: uses the storage of the user. Shared database: uses the storage of the owner of the data. Public database: up to certain capacity is free (depending on the number of users), more than that is charged to you, the developer. (as fas as I know).

iOS 15 Beta 5 fixed the problem that my ad-hoc app was having on the devices with beta 4. Hopefully, there will be an Xcode beta 5 today, too.