It seems like any time anyone picks up the Hawkmoon marker in Trostland/EDZ I get the audio for the quest (even though I've completed it). The line about going into the dam, ghost: "Come here often?".
Also, while running the quest in a duo every audio cue was repeated twice.
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Happened to me yesterday in a full fireteam. All three of us had to interact with the feather and it'd play AUDIO for EVERY INTERACTION while we were still in a fireteam. One person dropped but the entire time it'd play every interaction twice instead of doing a check if a single person in the party interacted with it. Was pretty garbo.