Placeable suns no longer act as light sources. No matter what I do, none of the color or location settings effect any visible change to map lighting during test play. Suns effectively now behave only as visible geometry, not light sources. In addition there is a single geometry-less, unmodifiable light source on all space maps at 0 elevation, -130 azimuth, which did not exist prior to S7.
No matter what I do, only the light from this hidden "sun" effects any objects/characters in scene, and since it doesn't show up in the solar system background tab, it cannot be modified or deleted. I no longer have any control over the lighting in space maps beyond the special effects sky layers.