The palm tree guards in shipwrecked throw coconuts that if you are wearing the vortex cloak will trigger it even if the coconuts aren't hitting you yet. As the palm tree guards throw the coconuts if you have them on screen, the airborne coconuts will set off the vortex cloak and drain its durability even though the coconuts are still in the air and haven't hit you yet.
Steps to Reproduce
Wear the Vortex cloak and get attacked by Palm Tree guards using their ranged attack where they hurtle coconuts.
This issue has not been confirmed by a developer yet.