Zero physical damage hits still impale

The generic "chance to impale enemies on hit" mod from the 'impaling' prefix on grafts is giving my Storm Brand, which deals 0 physical damage, a 25% chance to impale. Obviously these impales do no damage but they still proc effects which rely on impaling, including VERY negatively with The Impaler keystone by bricking my damage if one of my 0 physical damage sources such as Tempest Shield and Storm Brand deal damage to the target.