Wraith sphere removed when you get on a ship at harbor?

Is this a bug or intentional?

I used the Wraith Sphere at harbor, was wraithed, then stepped on a ship and became visible.
Intentional. Same if you use a wraith sphere on island while already under a wraith , it removes any wraith (even the one you paid for) the moment you step on the boat.
Thanks! Won't make that noob fee mistake again (hopefully, no promises though )
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