Rear tires on vehicle in VehicleGame sample detach and drift back from axel as user accelerates

This is a regression from 4.15 as it is unreproducible on a binary build in //UE4/Release-4.15 @ 3416026. Both my 4.15. and 4.16 versions were obtained from the EGL.

The more the higher the speed the user can reach the more pronounced this becomes.

I was able to PIE - Viewport, accelerate to top speed, shift + F1, pause, eject, and then move the camera to observe the separation as well. I'm attaching a photo from that. It isn't as pronounced due to my speed dying trying to pause.

Repro:

1. Open VehicleGame sample in the editor.
2. Accelerate and keep accelerating after start countdown concludes.

Result:
The rear tires separate from the vehicle's axel and drift towards the user.

Frequency:
100%