There is definitely a glitch with the latest update of iOS 18 Beta4 with Google Maps in carplay mode.
Google Maps on the car screen is almost responsive. It does not recognize your home or work address.
While there might be a workaround to get to your destination. Use Siri to get directions, but speak the full address and tell it to give directions using Google Maps.
For e.g. "Hey Siri, get me directions to "XX LOCATION" using Google Maps"
You can use Apple Maps and Waze. But its hard for people to use another navigation app rather than using what they are used to.
I find Google Maps really easy to use and handy, and now, with the latest update of Google Maps you can update live incidents, accidents, slowdowns and traffic reports from your dashboard