Im not seeing this. Is anyone else?
For me the autocast spells are at the top of the queue (so no action bar for them, spells don't have actions). The spells trigger. Then it goes onto the next unit, their action bar is displayed and life is good.
Derek, I just re-read your post. The part about "going onto the next unit" may be a clue. After autocast, if the next unit in the queue is the same unit that triggered the autocast, then you have the problem.
The other thing that makes me think that is that I remember soloing with Queen Procipinee and had that problem, then later I had another unit that had faster initiative who became that "next unit following an autocast (Noble Legacy)" and life was good.