There were no errors or warnings in the black box, only the fact that it paused for like 2 and a half minutes 2/3 of the way through "light world", after the (49) was recorded, for no reason. Now, my map is full black even though the world was supposed to be fully lit.
You'll see in the screenshot that it took just under 400 seconds to actually light the world, but due to the unnecessary pause, it ended up taking much longer.
The only explanation I can think of is that my map has too many light sources, cause b7 is loaded with neon lights.