Google Maps won’t talk when I’m on the phone?

I’ve checked the volume and tried muting and I still can’t figure out the issue. Google Maps works fine when I’m listening to Spotify but when I’m on the phone there’s no voice navigation. Does anyone have a fix for this?

Edit: 2022 Chevy Spark, iPhone 16 iOS 26.5.2

Edit 2: up until recently there would be audio navigation even when I was on a phone call, which I greatly prefer. I understand that some people don't want that but I do.