I've come across a bug with the behavior. It's rare, but sometimes it will skip to the wrong animation, ignoring the order that is set in which it needs to be played. If you have any actors in any of your games that you have this attached to(with the "stop" option selected, in case that makes a difference), try putting them in a test scene and have them play through the animation that has been broken up and keep reloading the scene. Eventually you'll see that it skips to the wrong animation.
Edit: I've noticed that it seems to happen primarily to animations split up into only 2 parts but i've also seen it happen to one that was split up into 10.