If you try infusing older S19 Adept Wendigo with S20 Adept Wendigo, you must use Upgrade module even tho they are the same weapon. It being from different seasons was never a problem with any other weapon, so I dont see why it should be with this. The only thing that changed about the weapon is it´s base paint finish
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Same name doesn't mean it's the same weapon The weapons are stored differently in the API, so the code of the two weapons is different and so it is not the same weapon and therefore it costs an upgrade module So normal