I had some stacked completed bounties and most of them have disappeared. All of the gunsmith ones have gone and half my crucible bounties.
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#Help
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Gunsmith bounties were reworked when update 2.7 dropped which is probably why you lost them all, and I"m assuming the crucible ones you lost were the ones that were also adjusted. It's the same thing that happened with crucible/vanguard/gambit bounties when Shadowkeep dropped, only this time I don't remember Bungie issuing any explicit warnings.