The view is stretched horizontally, so if you turn your head the image distorts in a sheer-effect. Extremely nauseating. It's like it thinks it's on a different phone and targeting the wrong render area. I dunno if the img is actually squished - could be the effect of rendering to the wrong screen area, IDK.
The first time I ended up resetting my phone entirely. Later I tried a barrage of things, and something along the line seemed to work.
I remember clearing storage for every service/app remotely related-looking to VR, oculus, Gear, turning off developer mode on the phone, rebooting...
If I want to do development with my Galaxy S8+ I constantly run into this situation.