Bug in Faldir's Cove, Arathi Highlands

[Webzlinger]

There is a kill bug aboard the docked ship. There's a cannon on board that you need to use in a quest: Death From Below. Every time you come within 5-10 meters of it you die.

[Doctor_J]

1) You posted in wrong section
2) Death from Below is already in the quest completer

Confirming the bug but seems this is strange as says world invisible trigger is culprit npc in combat log but no spawns of this npc near by.