Yoricks passive (mistwalkers) sometimes does not leap onto targets when yoricks E has marked enemys

Yoricks passive (mistwalkers) sometimes does not leap onto targets when yoricks E has marked enemys. am a yorick onetrick, ive lost alot of trades ingame cuz of this bugg, this needs to be fixed as this makes the game very unenjoyable, yorick is the only champ i like playing , id love if fixing the buggs in the champ was done before removing 2/3 of the passives base dmg. its not my video https://www.youtube.com/watch?v=6Jd_8o7SovE