[Gameplay] Jarvan ult only dissapearing visually, champions gets stuck and minions stop to attack

This bug appeared in my last game, I was playing Brand ( 27.08 at around 17: 00 - 17:30 EUW). Jarvan ults in a teamfight mid, I get stuck and can't move for most of the fight. After the fight, there is a invisable "structure" in the middle a bit infront of T2 turret I believe. Minions stop to attack it, and nobody can move over it. When AoE damage is done close to it, it says "invincible" or "invulnerable" not sure which one it was.

I don't know how to reproduce this issue, cause Jarvan ulted many times that game without it happening. I do believe that the ult seemed quite a bit smaller than it normally is when he ulted. But I reccomend finding the replay to se what happened. I think the in-game time was about 45 - 48 mins. If not then you will se the problem around that time, with minions stopping mid to attack the air.

I hope this gets seen and fixed soon

Kind regards Omgdor