Vayne Tumble Mechanic Bug

Hello RIOT team I recently played a game as Yorrick and noticed that vayne can tumble with her Q over the spirit wall while erected. I wanted to test this and she can also tumble past Trundle's pillar. I found this odd because vayne's tumble while being a movement mechanic she can not tumble over terrain and small walls like other characters can for example gragas dash or caytlin's net. if the trundle pillar is considered a hard surface that you can be stunned on and must walk around why can vayne tumble past it like it is a short wall that could be moved over when she normally can't tumble over walls . The same is said for yorrick spirit wall as the description says its a wall. Now I have seen before that vayne can tumble through maybe 3 walls but they are not consistent and looks more like a texture bug if anything because if vayne could consistently and reliable tumble over walls then she should be able to go through walls that other characters can with their movement abilities and she however can not. Thanks for the time! cheers