Hope people don't mind a late bump on this thread, but wanted to mention an observation:
Had a situation where I went down to the historian in CC (who was down). When he popped I instantly handed in my book, but ghost never spawned. I didn't realize that a guild member had done the quest immediately prior to me. I would make the assumption that both historian and ghost have a 1 hour timer, and both need to be up and ready for the quest to work.
Obviously not a bug per-se and if you're going to mess up on a step - this is the one to mess up on. Just wanted to mention it for people intend to do it back-to-back on characters. There may be a confounder, but it's a reasonable precaution.
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