Yes they are bugged. Bungie changed how they dropped when they were sunset so that they stopped dropping once you unlocked them in collections. New players can get one roll of each weapon, and older players won't get any drops. It will probably be another week until they actually make a statement on it, then another one for them to actually fix it.
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And yet it has now been two weeks and I've not seen a single guardian with any of the reissued weapons, Bungie really needs to fix this or otherwise I might just abandon the dreaming city altogether