We’re using a billboard component placed where the player aims in VR, since updating to 4.16 this is drawing a black spot in the right eye only when instanced stereo is enabled. Tested using Oculus.
The black spot is in addition to the billboard, which is otherwise drawn correctly in both eyes.
The black spot scales with the size of the billboard.
Note this is a standard billboard component, not the material billboard component which already has known issues on Vive.