I linked a video where it happened to me too. I stumbled upon a glitch after doing a specific finisher twice, as it happened twice (im pretty sure it was the same both times but the first one was a few weeks ago) and it was the same as this video. idk if its known or being investigated but i stumbled upon it again a few minutes ago as well. it seems it doesnt just lets you go through walls but as i did the finisher, i got teleported a bit far away on the map twice and it seems like it moved the collision of objects too. if i memorize the layout of the map (i was in volundr forge), i could move around and every collision i got corresponded to a wall/object/ that is normally on the map. but it seemed that the collision of objects was moved a bit while i got teleported during the finisher animation :)