I have the same problem. Galaxy S8 connecting to 2017 Ford Fusion. Started with the last android update. Each time the phone connects to the car the phone dial 0.
I found a fix.
After your phone connects to the car, leave your car running and turn off Bluetooth on your phone, so your phone will disconnect from the car. Then turn Bluetooth back on to reconnect your phone to the car. This should fix the problem, it worked for me. My phone no longer dials 0 when it connects to my car.