This bug almost costed me the game
And it has actually been here since Rengar's rework, and it's quite annoying. If you try to jump on the enemy nexus with Rengar's ultimate, it will just simply cancel out and nothing will happen from there on (I had forgotten about it in this clip).
https://www.youtube.com/watch?v=H7XiNJ4cJjc&feature=youtu.be
Edit: Just saw that this bug has existed since release
