Android Auto. Vehicle radio volume lowers for navigation prompts does not recover.

[Android Central Question]

When I am using the vehicles radio station, and Google Maps navigation through Android Auto, the radio volume lowers when a navigation voice prompt occurs. However, the radio volume does not return to normal levels when the navigation prompt ends. The only way to get the radio volume back is to remove the USB cable to the phone (disconnecting Android Auto). This used to work normally until a recent phone update. Very annoying.

2019 Honda Ridgeline. Googel Pixel (1). Connected Via USB connector.