I have experienced what seems to be the same or similar issue. Any map app I use in android auto shows up black and if selected directly on the car will crash android auto. However, using other apps, like Pandora work just fine. It appears any mapping app that has a dynamic map just turns black and crashes when selected. I use magic earth, and onX typically.
This only happens when using wireless android auto, but works fine when plugged in USB.
Started happening in the last several weeks, and is certainly frustrating.