I’ve encountered a bug when I connect my Pixel to Android Auto wireless without location services enabled on my phone and start Waze. Waze will ask for location access on my car’s screen. So I unlock my phone and turn on location services, but Waze never updates. It continues to ask for location access. However, when Waze goes from being displayed as the main screen (either full or as the main screen with another app in split screen) to being the secondary app opened in split screen, Waze displays the map and updates my location just fine. Waze has already been granted full location permissions via apps already. And it will display a map that updates as the smaller screen in dual app mode. However, it refuses to show as the main screen.
For reference, Google Maps will update its location and be able to display as either the main app or opened as the secondary app when this happens, so I know location is made available from my phone.