When a Dupe is carrying max of an item and attempts to pass through a manual airlock whilst game is on the fastest speed, the dupe fails to pass through the airlock, the airlock closes on them, and then the pathfinding of the dupe causes it to just stay where it is for a few minutes. Has caused Death.
Have dupe pass through manual airlock whilst on supply or store errand where they are fully loaded with an item (i.e. 200kg of sandstone) whilst game is on fastest speed. Easiest way to do this is set a storage bin to take a common item. Dupe might fail to pass through the door.