As per the patch notes, exotics that didn't have perks attached to their catalysts all got one this update. However, the Duality shotgun has no perk on its catalyst even after the update. Was it forgotten about? or was the perk not properly pushed to live? I do recall the catalyst used to have a perk of its own prior to one of Duality's reworks, but got removed due to the rework's changes. If it got skipped over on accident, I would imagine its past history of having a perk may have let it slip under the radar.