I got my prime engram today already, however, the buff didnt go away, and somehow more prime engrams are appearing. (I know about the beneficial in the short term and punishing in the long term) Right now, I have 2 prime engrams sitting in my postmaster, I'm not farming it in any sort of way, its just bugged and I dont want to be handicapped in the long term because of a bug.
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#destiny2
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Buff doesn't always disappear. It could stack for days not played I've been acting since launch of forsaken and my buff only dropped once on the first day.