If poppy is dashing towards mega gnar she can travel through his w (stun) and q (boulder) as if shes flashing. Also w does not stun her if it hits it only applies the damage. I even landed a stun on thresh and poppy mid game, both champions taking damage but the stun only applying to thresh. While in mini gnar form all skills work fine, and Gnars ultimate works fine as well.
Helmight1 votesIf Poppy's already cast Heroic Charge, she can't be stunned out of it in the same way that other movement abilities work. Hitting her with Wallop or Boulder Toss won't stop her in her tracks. However, I believe that displacement abilities would disrupt Poppy's dash - you'd just need really good timing. That's why Gnar's ult will disrupt it.
Tl;dr working as intended.
squirmingfrog1 votesi know they dont disrupt it but how does she not get stunned if i hit her with a wallop at the same time as thresh?
Helmight1 votesShe should still become stunned, but the stun duration starts while she's still dashing. So, if the stun duration is lower than the time it takes her to complete her dash, she effectively ignores the crowd control.
squirmingfrog1 votesok, thanks for the info!