I'm playing on US PC. I was playing Avarice Impurity and revealed all of the traps to do the Step Lightly Feat. It never gave me the feat, so I thought I had missed one. I went around the entire map twice and NEVER disarmed or set off a trap. Eventually I decided to give up on it, and started disarming. After disarming them all, I got the Untrapped feat, which made me realize that I had revealed them all. There was no way someone else had set one off either, because I had my team stay on Mogo while I revealed the traps.
This. if you wipe in the last room you have to go past all of the traps again, so there is a possibility you can set one off.