[GAMEPLAY] Lee Sin Kick Bug

Since someone else already brought it up and reminded me that I had this video, I had a video of a Lee Sin kick bug where his kicked target would fail to knock up targets that they collide into. In this video I was the Garen and I believe I should have been knocked up by the Ammumu when the Lee Sin kicked him but I was not.

This game was recorded on 9/16/17, which was on patch 7.18 (one patch ago from current patch).

I'm not sure how the bug is recreated, but there is certainly issues with the way Lee Sin's kick is working right now.

Is this intended or is this a bug?