[TTSK] Solarium Doors don't let sunlight pass through the glass

I noticed this with the glass doors from B&H, the medium industrial looking ones, had to make a hole in the roof for the sunlight to shine through. 

edit: The proper shadows showed before adding a ceiling/roof, but as soon as room had ceiling the shadows and sunlight went away, making a hole in the roof solved it.

I've looked at this a bit further, as the door does actually let sunlight through when opened, or placed on a diagonal wall.

The issue appears to be caused by the 'PhongGlass' meshes of the flat wall version of the door being incorrectly tagged as shadow casters.

The same door, but on a diagonal wall.