The latest beta (Sept 9) has shadow pop under certain circumstances when rotating the view in VR and NonVR mode.
Scenario .....
Fly the 737 North over SanFrancisco in sunlight (23hrs).
Select the view beneath the aircraft. (Undercarraige View)
Observe the left engine as you rotate your view from left to right. The shadows pop on and off.
In VR mode, this is also noticeable if you go to external view and rotate to be under the aircraft looking up. As you rotate under the plane, you see the shadow pop on/off across the whole aircraft.
Running all graphics settings on Ultra. GTX980ti.