After freeing Lord Withermoore in the current 3.0.76.796 Patch, he no longer "rewards" you by coming in an opening the force field in the Braccus Maze Dungeon...Once clicking on the pedestal, a brief pause occurs then the switch is no longer able to be selected/clicked on.
Coincidentally, the remaining (3) soul jars from the Trap dungeon, I saved up to this point, can still be used to by pass it rather than killing/freeing the undead around the table and instead consuming them for source.
Doesn't seem intentional, so reporting it.