Where is the last fallen?

Hey guys!

I need some help. As you can see, one of the fallen (and so, one piece of the fallen armor) is missing. I think it should be Astra, but she is nowhere.

Does somebody know what the hell is this? Is it a bug or what?

I will not start over the dlc cuz of this. I did every other mission what I could without the Fallen Armor.