running running macOS 12.0 Beta (21A5268h)
I make a basic project, single view controller with map view. Set the delegate, and connect the map outlet.
@IBOutlet weak var mapView: MKMapView!
In viewDidLoad I set the mapType to one of the following. Neither produces a map. Just blue.
mapView.mapType = .satelliteFlyover
mapView.mapType = .hybridFlyover
macOS Big Sur supported these modes, though iOS did not. It appears you are now running the iOS mapkit code in macOS code (universal). Will these modes be supported? The help page does not state they are deprecated.
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I am running on a new Mac mini, Apple M1, 16 GB