AMANAMU'S GAZE Body Armour bug

AMANAMU'S GAZE +2 to Armour per 1 spirit does not benefit from the "X% Increased armour from equipped body armour" Prefix/nodes despite being slotted in the armour. The armour is increase by #% Increased global defense and armour Prefix/nodes.

Is this intentional? It reads like the effect is apart of the body armour so I think it should benefit from the Prefix/nodes

I hope it's a bug and not a feature. Otherwise it would be still useless both for non armour builds AND even more for armour builds