I just want Samsung to look into it if they already aren't. It's a possibility that with the two power giants working on it they can and will figure it out. I use Android Auto all the time.
Please try force stopping the app, clearing its cache and rebooting your device. If issue continues, please send us an error report to help us debug the issue. We apologize for the inconvenience and appreciate your contribution to the beta program.
One UI Beta Team