Poppy's Heroic Charge versus Vayne's Condemn bug [GAMEPLAY]

I've been playing Poppy recently and this has happened twice in my games. It seems that when Vayne's Condemn (E) is used versus a Poppy that's doing an Heroic Charge (E), Poppy gets stunned even though she wasn't hit by terrain.

1- Poppy uses E - Heroic Charge. 2- Vayne uses E - Condemn. 3- Vayne get's pulled a bit by Poppy's (but not entirely - as one would expect). 4- Poppy get's pulled a bit by Vayne and gets stunned (even though Poppy wasn't hit by terrain).

Expected results: Just like Alistar's Headbutt interaction with Vayne's Condemn (as I see), Poppy should be sent back and no crowd control should be applied to either champion.