I just Body Slammed through a champion as Gragas. This used to happen with monsters but was fixed?

Literally just Body Slammed through an enemy champion. Thought it was a bug so I ulted where he should have been, but nope - he literally was not touched by my body slam. Literally went right through him. From the looks of it he auto'd me right as this happened.

This used to happen a lot when doing gromp, and it was really frustrating to go right through the wall. They said they fixed it in one of the previous patches, but this literally could be game changing in the pro scene where he is played a lot. Not sure how many of these bug reports get viewed, or how often - but on a popular champion like this, I feel like it's kind of a needed fix.