Salt Mine with splinter removal as the mechanic doesn't work correctly. The first room no issue, shoot the splinters it progresses. The next room after shooting the splinters and completing the bonus objective the orange phase door won't drop. The timer runs down under 3 minutes then finally allows progression to final room before the boss. In the 3rd area before the boss, breaking the splinters and shooting all the mobs runs the timer runs all the way down to 30 seconds and the mini boss that has to be defeated to open portal still hasn't spawned. At that point I leave because pervasive darkness is next. Tried it two times with combatants at 50 over and 20 over. Same result.