Can you share with us the exported files so we can debug? unity@esotericsoftware.com
I was able to fix it but this seems to be an ambiguous case you seem to have caught. We'll be deliberating on how to best handle it.
But for now, you can set the "end slot" of your Clipping attachment to be the very last slot. (I think in your case, it's called "deadEffect")
That should make it unambiguous and be able to fix the animation.
If it doesn't, let us know.
You may need to choose a different slot depending on what effects you add, actually. Just check it appropriately.