Frost Blades of Katabasis Not Working with Ungil's Gauche

Ungil's Gauche is a knife weapon, so it should be a melee weapon.
Frost Blades of Katabasis requires a melee weapon (non-specific).
Frost blades is disabled when Ungil's Gauche is equipped. I am not sure of the reason, but this seems to be a bug. Not sure if it is with Katabasis or Ungil's Gauche, but suspect the gauche is is not properly categorized as a melee weapon. Well, I say not properly categorized, but maybe knives & daggers are not actually melee weapons?

NOT AN ISSUE. The problem was with a support gem that had a mace requirement. I would delete this is I could figure out how.