I just completed the 3rd required quest for the self sufficient milestone in the book and it hasnt unlocked the node milestone, please fix this bug
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I had that same problem after I unlocked that node for the Titan. Several of my clan mates had that problem as well, some with Warlocks some with Hunters too. Just restart the game and it'll be unlocked and you be able to turn it in.
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Looking at your book, the node is unlocked. If you're seeing something different you may want to restart your game.
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On your ps account? If so, your hunter still has the gunslinger subclass quest (just a handful of bullets) still to complete.