Similar problem. Thought I picked up the quest on my Hunter, Warlock sees the quest on the Compass vendor but cannot pick up "Requires Tracing the Stars 1, 2, and 3 completed" (they were done on that character), quest is gone from Hunter now and does not appear on the vendor on that character. Mara doesn't acknowledge my existence.
Update: DID find the exotic quest on my Quest Archive, on my Warlock oddly enough (Compass vendor still says I need credit for the Tracing the Stars legs) likely because I had at one point possessed it.
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@BigSmellyBob thank you for that update. I checked the Quest Archive on my Warlock and also was able to get the quest.