It would appear that all armor sets in the game for Tankers, Brutes, Stalkers, Scrapper and Sentinels have had their status resistance broken.
I have checked all ATs none of them has status resistance show up on their combat attributes. Knockback, Pool powers and set bonuses show.
On top of this, the defense debuff resist and tohit debuff resist listed in Obsidian Shield for Tankers and Brutes is not showing either and I have tested that they don't have any effect either.