[Gameplay] Yorick Bug

Yorick's E does not activate dash on mist walkers in this instance. This is the first time I've noticed this, also my first time laning against renekton as yorick, not sure if that has anything to do with it.

If this is a normal interaction could a rioter please explain when the function of the mist walker's dash doesn't work and if that's the case making it clear in the ability tooltip would be really useful because I don't see anything.