1) Navigate to https://www.babylonjs-playground.com/#G46RP6#2 (using Babylon 3.3.0-beta.1)
2) Click on the helmets to launch into VR
3) Press the Esc key in the browser to leave VR
Notice that the left eye moves around and you can click in it and move the camera around. The right eye doesn't allow that.
In our experience, Esc also normally leaves stereoscopic mode, but it remains in stereoscopic mode.