C4D Lumas shader only works within volumes

[Eddoron]

I've noticed that the lumas shader, which can be used for multiple specular layers or
as a mask for light/unlit areas (for example, clearing wrong AO on lit sides)
doesn't work properly in Corona. I just noticed it when I was doing something that didn't have a volume around it.

Below are the examples.
1. AR: how it should work-unlit side is illuminated
2. CRN: without volume
3. CRN: with volume
4. usage examples (night side is lit)

Easy to reproduce, scene file provided.

Win 10, latest updates (everywhere)
R 19 latest, latest Corona build

[Eddoron]

bump...errr...normal!

BTW, it'd be nice if we could also get support for the "Chanlum" shader. It's a comfortable way to simulate very short hair, distant hair or fuzz.