Test this and retest this right now. If I see an announcement that adepts are not dropping properly next season like double perk weapons from this season, it will be only incompetence and only the fault of the devs.
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Might be a hot take but, all weapons should drop with extra perks. Vendor resets don't fully reset, they only go down by 1 after the season ends. So if you have 5 resets, then by next season you'll still have 4 extra perks on your dropped weapons. Additionally, ALL adepts at base drop with double perks.