Apple Maps turn by turn voice on CarPlay only in mono

Hi!

I'm sorry, if this is the wrong place to ask this. Please advice if you know a better place.

I recently bought a new Hyundai which comes with CarPlay. When I connect my iPhone with a cable, CarPlay is running fine and the Music is played in stereo on the car's speakers.

But when I start Apple Maps I can hear turn by turn voice commands in German. But they are only played in mono on he box next to the driver's seat. They are not played anywhere else, but the music stops for all boxes.

I tried to figure out, what the issue can be and how to communicate the issue to Apple. So I think it's related to this thread: https://forums.developer.apple.com/forums/thread/732202

Anything I can do? Is there a hidden setting to change that? For me it feels like a bug, I doubt that this is expected.

Thank you!