Question - Conc Opp - Do two stack?

[Shincula]

Title more or less lays it out - will two concordant opposition items, such as one glove slot and one goggle slot, each proc separately? Or is this a "character affect" that would have the same % chance regardless of the number of items worn?

[Doxmaster]

Weapon+ accessory=Yes
Weapon+weapon=No
Accessory+accessory=No.

glove+goggle=accessory+accessory=No.

[Glenalth]

Weapon+ accessory=Yes
Weapon+weapon=No
Accessory+accessory=No.

glove+goggle=accessory+accessory=No.

In addition to that, the stacking is a known bug and could go away at any point a dev feels like it.