Gameplay bug: Kassadin ignoring veigar stun

Playing a game against the new Kassadin skin (Cosmic Reaver). Every time he ulted into the center of the veigar stun, he could walk out the other side without getting stunned. This netted him kills in multiple situations (I witnessed this happen 3 times in the game) where he otherwise would not of.

Steps to reproduce: Pick Kassadin + Veigar Level Kassadin to 6 and skill ultimate Have Veigar use his stun away from kassadin Have Kassadin use Riftwalk into the center of Veigar cage (dodging the stun proc) Have Kassadin move out the other side of the cage.

Expected Result: Kassadin is stunned

Observed Result: Kassadin is not stunned and freely leaves the circle