[GAMEPLAY] Cassiopeia's W bugs minion pathing

I've noticed since the change to Cassiopeia's Miasma (W) that minions, particularly siege minions, seem to have pathing issues when passing through it. Either they try to go around it or get stuck inside, unable to move. I'm able to recreate it fairly consistently by just using W on a minion wave, though it seems to cause more issues some times than others and minions approaching an already cast W don't seem to have the same issues. I'm not sure if this also applies to jungle creeps, but I'd expect they have similar coding and thus similar issues.

I'm assuming it has something to do with the Grounded effect or the way it interacts with walls (are we using Teemos?).