SwiftUI Map shows through toolbar.

Hi, On iOS 17 beta I have drawn a Map inside a NavigationStack with toolbar buttons. The map is drawing itself above the toolbar background and behind the toolbar buttons, that is the map is drawing right to the bottom of the display but the buttons are visible on top of the map. The Apple Maps logo etc has honoured the safe area correctly. Anyone seen this and know why or how to avoid this? If I replace the map with another view the toolbar is handled properly. Any suggestions appreciated, cheers.