ROFL.. srsly?? OK, so apparently there are 2 mushroom islands now, thanks to whoever uncovered that part of the map, lol. So if you take the Mushroom Island quest from Engel, it’s set up to “complete” once you reach the original Mushroom Island. There is probably a way to trigger a “reach coordinates within 100 blocks or second set of coordinates within 100 blocks” but I’m not sure how to write it yet so to complete the quest, you have to find the original Mushroom Island.
Man, that ocean makes me want to resurrect my ol’ pirate ship.. yarr!!