Flecks seem to be culled out a bit too early in the VR mode when they are scaled up. The pristine floor in Johns Beech's train game uses a giant fleck the technique doesn't seem to be feasible in VR.
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This also occurs with looseness on sculpts. See “Brick Smash 2.0 - Level 1” for an example of a painting is rendered transparent or partially transparent depending upon the size and distance from the camera. See “Brick Smash 2.0 - Level 10” for an example of a sculpt (the ground) with looseness that is more or less transparent depending upon the distance from the camera. These scenes are marked as VR Compatible, and do not exhibit the same rendering issue in non-VR.
Yeah I tried this and found the same. John's aware of it and has given it to the QA folks I think. So hopefully a fix is on its way...