For I wanna say a few months whenever I host a multiplayer world whatever explored areas on my map become reset, and the map is black again. I've tried reloading the game, back in and out of the world, and it happens no matter the player or world. For anyone in the world it's fine, but when hosting a world it always happens no exceptions. I don't know if I can fix it, or if it is just a bug.
(First pic has me filling it a bit, second is after I exit and load back)
(First pic has me filling it a bit, second is after I exit and load back)