It makes sense that there should be some reparations if your given already unlocked items that belong to the knock out system, like shaders, emotes and projections.
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Honestly, back in Y1 and Y2 they used to offer a lot more than just the cosmetic item since you'd usually get shaders or mods along with that drop. Now that shaders are one time unlocks they are treated as items and mods come off ada-1 now and are infinite use. Really I don't think duplicates are a serious issue though it being bugged is. But I think the solution is to add more stuff to Bright Engrams as additional drops like planetary materials, legendary shards and cores and things that players need as they are only earnable by playing which would at least reward a player something even if they got a duplicate drop.