VR does'nt render content

[PavelBoytchev]

@Achim_Rautenberg

I removed every appearance of layers in my code and everything works just as expected.
Two days of frustation to figure this out.

Some layers are reserved for VR/XR:

Layers and WebXR

When using WebXR, layer 1 and 2 are reserved for XR rendering. When assigning objects just to layer 1, they are only rendered for the left eye. Layer 2 is assigned to the right eye. Objects on the default layer 0 are rendered in both views. However, when using other layers the visibility and raycasting control should work as usual. Can you give it a try with layer 3?