Front Line Champion Pathing Bug

Hi Riot Support, I want to report a Champion Pathing bug.

I think there’s still a game-changing bug with champion pathing. I mostly played Assassins and I tried put Shen in the back (near the wall) and it mostly worked pretty well since he was able to pull the opp's frontlines and my assassins were able to dive their backline. However, sometimes it just didn't work. Shen was the one running to their frontline instead, and their frontline just stood still or in some rare case, both Shen and their frontline just stood there (this also happened in one of the Scarra’s games (already timestamped): https://youtu.be/zBKBaL7oTv4?t=1828).

This caused my Assassins unable to dove their backline and just straight up losing the game. Even though I won against the same player the round before with the exact item and position. Plus, it also happened to every other frontline champion like Kassadin and Chogath for example. Is this really a bug? And will you guys fix it before the ranked match available? (because If not, I might avoid playing assassins in ranked)