Black edges on geometry

Have started a new build in 4.22 for the Oculus Go. My settings are VR template - all lights static with scalability set to 2d/3d and mobile device.

My problem is that I keep getting black edges on different geometry, even simple wall meshes which I wouldn’t expect. This was also happening in 4.21.

What I am not sure about if its somehow down to Datasmith which I am guessing it isn’t - or something to do with my scalability settings, which are set to Epic.

As usual I have googled and trawled the forums for any answers…Any help would be fantastic!