I’ve noticed that I’m having the same issues with connecting my watch (cellular) to my car stereo Bluetooth. If the issue is ever gets resolved with the iOS 13, will the connection issue still persist with the watch OS?
Side note: This is while trying to use the watch solely (without the phone) for music and making calls. Until the known iOS 13 issue has been properly addressed, I had hoped to be able to use the watch instead. Thank you for your help.