Wheels become detached from vehicle if simulate physics is switched.

If Simulate Physics is turned off / on for a vehicle, the wheels will become detached from the vehicle and keep rolling if they were rolling at the time that Simulate Physics was turned off.

1. Download the attached project, unzip it, and open it
2. Press play
3. Drive forward and press Z twice
Result: The vehicle's wheels become detached from the vehicle
Expected: The wheels should stay with the vehicle

Vehicle wheels fall off upon re-enabling physics