RawLighting / LightSelect Direct Raw and SSS

I have some questions regarding the back to beauty compositing.
1: Why does the vrayRawLigting element contain minus values where the sss2 mtl is. It forces me to clamp it away in order to reconstruct the beauty properly.

2: Why, on the other hand does the equivalent in light select world (The Direct raw mode) contain positive lighting information for the sss2 mtl?
This forces me to use a multi matte to kill it in order to reconstruct the beauty.

How do I use this data? I mean… its likely not rendered by accident.

If anyone wants to take a look, here is the scene (max 2019), the exr and the fusion comp file (fu9.02)
https://drive.google.com/open?id=1fS…UQ40XxNtZJ-EiY