So I was leaving the Hermit Crab Island and one of the masts, out of 2 with a new Deck Illuminator attached to it, bugged out and kept repeating the releasing sail animation, but would never stay released. It would continue to return to it's closed animation and then open continuously. Releasing the sail does nothing. I'm not sure if it's the Deck Illuminator being on it where the bug can occur or if this is caused by something else. I was Walter and had big Woby on my raft when this happened. I had hammered the mast and it went back to it being a closed mast, but releasing it allows the bug to happen again. My guess is that completely deconstructing the mast would entirely stop the bug.