Not sure if this is intended, but i've noticed on two of my characters that while having the first part of 'A light in the Dark' exotic bounty, 'complete "The Summoning Pits" stike on the moon', this will not trigger when doing this weeks heroic strike.
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You need to choose the strike from the moon itself and not the playlist on left side of the screen.
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There's a special version of the summoning pits