There is actually no sample project in the link you shared, but just an example of the issue in a video. This is helpful, but unless I can reproduce this in a blank project with some simple assets, it is going to be hard to determine if this is a bug, or just a setting you could be overlooking or not enabled.
A few questions though, are you using Ray Traced Distance Field Soft Shadows on your directional light?
Since you are creating a VR project, I am assuming you are also previewing the game in the VR preview to get an accurate representation of he final outcome?
Thanks,