Wireless CarPlay blocking data / preventing phone from connecting to cellular data.
Since updating to iOS 15 on my iPhone 12 Pro when I connect to wireless CarPlay apps on my phone say they are not connected to the internet, so I can't search for destinations in Waze, or Apple Maps, it won't send text messages (via voice in CarPlay or via physically on the phone). It sends iMessages via SMS (no data). As soon as I turn wifi off to disconnect Wireless CarPlay data starts working again. This seems like a bug bug in IOS 15 that it is trying to get data though wifi / Wireless CarPlay. (see picture below). As soon as I disconnect wireless CarPlay Waze (and other apps) get data again and start working normally.
I don't see Wifi-Assist in IOS 15 anymore either.
iPhone 12 Pro