I tested 0/3, am wondering if it could be related to how fast the inventory loads after you zone in?
When I first zone in to the entrance area, the temporary items doesn't appear in the inventory. Then it gets loaded together with the wardrobes.
So if you are fast enough, you can could be in the BC before the inventory finish loading and the temp items only got loaded while you are in the BC.
i.e. The system on disable the temporary wardrobe when you enter the BC itself, so if the temp items load after the entry, they could remain in the inventory.