I think I found a bug with the lighting layer (something I noticed because the Tomb of Annihilation module has "has sight" unchecked for all NPCs to help with lag). Easy way to test is in Map (S) L1 Rotten Halls, room #10 on the west side. The Wights have emits light 60 ft, dim light empty, all players see light unchecked, has sight unchecked. If you grab one of the Wight tokens and drag them down in line with hallway 5c to the east, and watch the dark/light lines against the walls, you can see that the Wight token is emitting light and seems to cause lighting calculations. Removing their light entirely (which does nothing from a play standpoint since they have no sight and no "others can see"), stops it.
