Annie Ult stunning while untargetable.

Now I'm not certain this is a bug or if its working as intended. That said whenever I am using Vladimir or Fizz and I'm in pool or playful/trickster and I get ulted by Annie the stun not the damage but the stun itself persists for a second after the ability is done. Its happened multiple times to me and its quite annoying to dodge this ability and then still have it screw me over. The only way it doesn't give me the stun itself is if I'm not in the range of the ability when it lands. So if I pool then flash before she ults, or If i pole far enough away that the bear doesn't land on me. But if I'm in range of the damage I will be stunned even though untargetable.