walk through nexus & get stuck inside edge of tower...wtf?!

i just played thresh on aram. respawned and began walking towards lane but didnt arrive and was like wth so i look back and im stuck in place unable to move more than a very slight twitch while standing somewhat on top of the edge of a nexus turret. I rewatched the replay and i walked right through the edge of the nexus as well. This game is like 10 years old, why the hell are characters getting stuck inside objects? I recorded the clip but ofc it's in the dumb format that league uses which isnt easy to post anywhere.