This bug deals with Shadow Falcons created by the “On Wings of Shadow” node in the Dive Bomb tree. Any animation that is being preformed by a regular Shadow (when it is copying your action) will prevent Shadow Falcons from being created and preforming Dive Bomb.
From the wording on the node and how the animations play out in game when the Shadow is NOT preforming an action makes this seem like a bug. If your Shadows are standing still they do not disappear when a Shadow Falcon is created so their animations should not prevent Shadow Falcon creation or action of Dive Bomb.
Another issue that is occurring with these Shadow Falcons is that they will interrupt the animation of Falcon Strikes and make it go on cool down, most times before getting a single hit off. This is not how Aerial Assault works which would lead me to believe this part is also a bug.
I have created a short video showcasing these interactions, there should be timestamps in the description but it is less than 3 minutes total: https://www.youtube.com/watch?v=cVblR3ytCgU&ab_channel=MahonezGaming