MapTrackView in widget CIQ application - onBack not called

Hi! Trying to use onBack to switch from MAP_MODE_BROWSE to MAP_MODE_PREVIEW (as in MapSample example).
Under simulator (sdk-win-4.1.2-2022-04-07) it is called and switched, but on the device (Edge 1030+ v6.40) I see the MapTrackView is entirely closed.