[WaifuApple]

There are some locations that, when you exit them, will consistently break lighting - as in, the overworld will not load it's lighting regardless of whether it's dark or light. These are, from what I've seen:

Darkwood Manor
Old Iron Mine
Chinatoa Mines
Water Stores
Goblin Cave
Colossal Tower

I have only checked the mainland so there may be other cases like this. But to reproduce, go to any of these locations at... a suitable time where the lighting on the overworld is obvious. So somewhere around night - and then leave again. You'll notice that the overworld is bright again. Lighting will return to normal if you exit from any other location not listed here on the mainland. Could use someone checking other continents. I may have also not checked the Jammer Cave, so that might also be worth checking.

[Autumn]

Jammer Caves and Fort Arjav as well I will add.

[WaifuApple]

Thank you, usually forget the fort is there.

[Neus]

This has been corrected.