Wards make you auto path around them.
So weird. I have no idea why I like this game with all of the clunky, seemingly not intended since it doesn't really make sense (and i eventually path THRU it anyway), interactions in this game that are basic but persist for years.
EDIT: I remember a long time ago people were after Gosu? (vayne streamer??) for hacking and it turns out Caitlyn laying traps like this made her path around it automatically from the game itself. Seems related.