The 1900 bonus to armor while equipping a shield does not increase bash damage by the 0.022446% resistance coefficient that it should normally do with any other source of bonus to armor. There should be atleast a baseline increase of 42 bash damage (before % based modifiers) by equipping this passive, however by testing it on dummies I've found this to be not working in that regard. The damage of bash stays the same as if the passive wasn't slotted at all.
Maybe there is a hidden cap of bonus bash damage sourced solely from resistances? If so, can we get some information about that?
If this passive is working as intended, then please update the description to indicate it only works for mitigation purposes.