I was allowed to complete it today on my Human toon.
"Talking to Maeva to get the charges:
Pact Researcher Maeva: The ghostfire charges are prepped and ready, Commander. We'll need four of them to do the job. I'm standing by to hand them over.
https://wiki.guildwars2.com/images/5/5a/Talk_quest_option_tango.png I'll take one now.
https://wiki.guildwars2.com/images/f/f5/Talk_end_option_tango.png I'm not ready yet. "
so that part above, i was able to get two charges, but then i had to go kill some stuff so when i came back to get the rest of the charges, Maeva wouldn't stop "pacing, swimming back and forth between the opening to the hull"
i thought that was it, but after waiting a bit it destroyed the ship with those two charges , the white ghost fire appeared, then it continued on.
I also noticed when i clicked on the wrong toon, a menu like that of the list you get when clicking on a Vendor. The Karma triangle appeared momentarily.
i had previously completed it just days before on another toon, Norn, with no bugs whatsoever.