The tome of want has completely disappeared on my titan character. My warlock and hunter still have access to the tome, and had no troubles completing the quest to get access to the tome earlier in the episode, but a few days ago my tome has completely disappeared from my titan character. I've attached an image link of my Titan's inventory to show that it's just gone.
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This happened to me too. I had to switch back to path of resolve to re-acquire it from the slab reward track and then back to path of ambition