In a +10 Dawnbreaker the mob ‘Nightfall Curseblade’ flew through the air and off the ship, making the dungeon impossible to complete as we could not kill it to trigger the side ships to spawn. Neither could we mount. I believe a Ring Of Peace by the monk knocked the mob which clipped something on the ship causing it to fly away.
This basically killed the key.
On a side note, this dungeon is incredibly buggy with this stuff. When landing on ships I have clipped through them, when landing my character walks as if its drunk again on the large ship. I just don’t get why the ship isn’t just static during an m+ with a timer, that would be my suggestion to fix all of these issues. Keep the ship in one place. It bricked the key competently, so pretty frustrating and a complete waste of time.