VRayLightMaterial applied as submaterial doesn't work correctly

V-Ray V-Ray for 3ds Max Issues
1

As in th title.
VRay 5, update 2.3
CPU and GPU - the same thing.
3ds Max 2020 file:

VRayLightMaterial bug.jpg
VRayLightMaterial bug.jpg640×480 33.1 KB

VRayLightMaterial bug.zip (131 KB)

2

It’s a known limitation