When playing Zac, if you Q(Stretching Strike)-Auto Attack-E as fast as you can, the E(Slingshot) will not go off. Instead it will charge and you will have to click as if it is normal cast, EVEN THOUGH I play on all quick cast.
Bug is produced by Q-ing an enemy, auto attacking, having W go off, and just pressing E for a jump right in front of you. The E will charge itself all the way and not go off. You must click and even then sometimes it does not go off.
This has been a bug the past few months where Zac's E becomes some sort of normal cast as opposed to Quick cast. The bug has happened to me at least 3+ times a game. With the new update, it has happened even more so.