Yasuo windwall sometimes causes veigar ult to disapear 360 degrees around yas. (gameplay)

Unfortunately, I was not recording the game this happened. Twice as Veigar, I ulted the enemy yasuo and the ult disappeared mid flight even though the windwall was not in its way. Both times the ult disappeared as soon as Yasuo windwalled.

I don't have anyone to jump into a custom with me to try to replicate it. Not a great bug submission but if someone can test it it would be appreciated.