A small ideea

So i happend to encounter this little bug while I was playing solo sloop.
I was trying to get to chicken isle but got sunk 1 time on the way and i respawned right before the ship fully sank. I took a mermaid to a new ship and finally got to chicken isle but the island didn't fully load as you can see in this image and it gave me an ideea.
So let's say for a quest you would have to gather 3 different maps from 3 different islands and after you collect all the pieces you get coordinates for a new island at the edge of the map. The island is almost completly under water and you need to fight an NPC ship so the tide will fall and you can get to the island where you fight a legendary pirate(Black Beard,Hody Jones, Charles Vane), like a harder 1 vs 1 fight with an NPC that has powers.
You could add a story to all this, not necessarily with cutscenes or some crazy stuff, maybe an interesting monologue before the fight starts, battle music. And after all is done you get a really big treasure, that can be carried by 1-4 players, worth 50-100k.
Thank you if you read this textwall, you're awesome!