I've got a Xamarin Forms application with some GPS functionality that has been working great for years. Since we've upgraded to 100.4 our GPS functionality is not working on Android. Still works great on iOS though. Basically as soon as we set the IsEnabled property on the MapView.LocationDisplay to true it immediately resets itself to false.
We've tested this on two different Android devices, one with 6.0.1, and one with 7.1.1. Doesn't work on either. I've attached a repro solution here.