Google Maps audio no longer as a Phone Call on vehicle' audio system
I have IOS 15.4 installed on my iPhone. I can only hear the iPhone Google Maps App voice directions when I select "Bluetooth" as the audio source on my Subaru entertainment system. Previously, Google Map voice directions interrupted the currently selected audio source and played as a "phone call". I have tried deleting/reinstalling the Google Maps App and removing and reconnecting the iPhone from the vehicle.
Google Maps > Settings > Navigation >
Mute State = Unmute
Guidance Volume Louder
Play voice over Bluetooth = ON
Play as Bluetooth phone call = ON
This is relatively new behavior. I have not tried regressing to previous IOS levels. Any ideas on how I to get Google voice to play as a phone call?
iPhone 7, iOS 15