Stereo layers persist in the HMD after VR Preview is closed. This persists through opening other maps and using VR Preview in those maps.
Note: 4298992 in //UE4/Main is the CL just before //UE4/Dev-VR's copy-up.
Expected Results: Stereo Layers are removed with the rest of the map when VR Preview is closed
Observed Results: Stereo Layers persist in the HMD even after VR Preview is closed.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-63210 in the post.