I'm not sure if this qualifies as a actual "bug". It's just a text error. So I didn't think it was necessary to use the template to post this.

Iga Zukin +2:
Augments "Innin" effect

Iga Hakama +2:
Augments "Yonin"

Any other item that has Augments "Whatever" is just Augments "Whatever"... not Augments "Whatever" effect. This leads me to believe that the Iga Zukin +2 has text errors on it.