When I join a new game, or when I open Studio and open a new map, the dynamic light grid seems to be initialized on one side of the X-axis, but not on the other side, resulting in a strange “half-lit” effect. Toggling GlobalShadows on and off doesn’t fix the bug, and neither does walking into the shaded area. It typically fixes itself after a minute or so.
That’s not what I mean. For example, in your latest screenshot, what would happen if you attached a big (range=30) red point light to the center of the blue part?