Hey, we are on 5.4f3. We found this bug allready in 5.4b23 but hoped it would be fixed, but its not
B23
5.4f3
I filed a bug report Case 834084
This is threatening our upcoming release, hope to resolve it quickly, thanks!
edit: Oh, we are using SteamVR and Single pass render all settings at SteamVR recommended values. Also if I remove occlusion culling it works, but its not really a fix because the scene will start to lag because of too many polygons rendered