Read today's patch notes. This is no longer part of Petra's weekly bounties. You now only need to complete the Ascendant Challenge and Blind Well ones.
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Now all sorted Thank you bungie 😊
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I done the other weekly off petra but still says 2, well it did until this update just broke the game
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I can't confirm what it says in-game since I won't be on until later, but the patch notes says this is no longer a bounty at all.