I was mucking around with console commands and while exploring the full map I realized there was a tiny fifth "island" off in the corner. It looked like it was covered with cave assets, so, I spawned myself over with
c_gonext("stalagmite")
But when I arrived, there was nothing but pitch blackness (not night, since I could still see Maxwell) and a few pieces of rot. I exited and relaunched the world in the hopes that the island would respawn, but instead it disappeared entirely.
Furthermore, the pitch black backdrop remained (though I was able to see sea asset animations) until I got within a short radius of the closest island, at which point the orange sea backdrop reappeared.
Not sure if the island spawned as a result of my godmode-ing around or if this's a legitimate glitch.
Unsure. Launch world, use console commands to reveal full world, see if tiny 5th island appears on the map and try to spawn your character over to it?