[GAMEPLAY] Shen Taunt lands but doesn't affect taunted champion

Shen taunt hits enemies, but they do not walk towards Shen. I noticed this happens in game from time-to-time when the taunt is either max range or very close to max range. The enemies have the flashing red on their faces as if they are taunted and the sound goes off, but they can still walk and use abilities as if nothing happened. I also made sure that the enemies I taunted did not have qss or merc treads or anything else to cancel/shorten the duration so I have no explanation for why this occasionally happens except that it is a bug.