I also have the problem with the item. But I think it’s currently a general problem that you’re teleported to the center of the map as soon as you use the item.
However, this problem has not only existed since the latest Fortnite update, but for much longer. If you open the item incorrectly, you are very often teleported under the map, so I have to respawn manually. It’s almost as if the floors of the individual maps are too thin and you bug through.