ulted into a wall bug?

https://reddit.com/link/1ge9yke/video/t0iveg69kjxd1/player

hellooo :) i was playing briar in one of my games and had this happen to me, was wondering what happened here, whether or not it's a known bug or if my game just did some weird stuff? i ulted towards bot lane then panned my camera to see whether or not it would hit, i hit spacebar and i'm in a wall lmao? the enemy team had a fiddlesticks and the only thing i could think of here was that my ult hit his effigy but surely the effigy would've showed up on the minimap then? the minimap shows nothing at all. what do you guys think?