Shadows appear to flicker on the Vive when using dynamic lighting on a translucent surface

Shadows appear to flicker on the Vive when using dynamic lighting on a translucent surface. This is even more noticeable if the engine scalability is turned down.

[NickW] Can someone confirm if this is HMD only? I've heard reports of a similar thing happening, but it's regardless of whether you're in VR mode or not.

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1. Download the project ([Link Removed])
2. Make sure that the vive is set up and turned on
3. Open the project
4. Play in VR preview
5. Walk to the rock that states the issue is more obvious here
6. Look around
7. Notice that the shadows at the base of the rock flickers

Expected: The shadow would remain consistent (as it does not in VR preview)
Result: The Shadow flickers as the HMD is moved around