Season of Skyrim doesn't convert PBR landscape textures to snow in winter

[Moyse06]

Tomato and Vanaheimr Complex Material landscape works fine.

Faultier PBR does not convert many of the landscapes to snow.

Tested with latest Parallaxgen 8.0, you can reproduce this in Riverwood with a vanilla modlist and Season of Skyrim. I suspect it can be fixed with a very minor Base Object Swapper INI change. Most likely Season of Skyrim is swapping the wrong PBR texture.