Dark spots have begun appearing while I'm playing the game. One spot in particular was not dark as I flew over it, but when I turned right around it was there in the ocean. Attempting to fix it only made it much worse. This has been in the game for awhile, but it's never happened right in front of my eyes. I'm playing strictly vanilla. I'm sure this will get closed and checked as resolved or duplicate, but this needs to be prioritized before you start adding fireflies to the game.