Festival anivia wall displacement/pathing bug

If you place a wall as festival anivia on a moving player, that player does not get displaced and you get stuck if you try to path to the other side of the wall - you can still path away from the wall. If you keep trying to pass through the wall while stuck, you will sometimes jimmy yourself to the other side. I can get this to happen most frequently when placing w right on the edge of my character, so I don't get airborne but I do get slightly displaced. I suspect what might be happening is that I'm getting through the ribbon which is looked at at the edge of the wall? That's my best guess.

I have managed to get an almost similar effect with normal anivia by trying to place the wall such that anivia falls slightly between the third and fourth pillar of ice (lvl 1) - I got it to mess up my pathing but nothing on the same scale.

This bug has made me choose not to play festival anivia in ranked because of my inability to predict which pathing will occur if it happens - and it means that displacing enemies into my ult is less possible, as they no longer need to run around the wall to get out sometimes.