Gragas Q bug 5 months old

video of start of bug: https://www.youtube.com/watch?v=VxP97k4hs14 board talking about the bug: http://boards.eune.leagueoflegends.com/en/c/suggestions-bug-reports-en/dFyEk3oL-gragas-q-bug

so.. what it looks like is you throw your Q and it disappears then your CD goes to 0 and your mana cost for spell goes to 0 its as if the spell is stuck in its 2nd phase