Shaco Stealth or Diana Q bug

There was a bug in an aram I found where Diana was able to attack me when the q hit. In the ability description it says reveals them if they are not stealthed. https://gyazo.com/fee8fe0731a94c7414aefc45f262b5d4 (Diana's ability description). And shacos q which is a stealth, becomes invisible https://gyazo.com/60b109a2f6a6f8a1fdd762cb0fa58d93. Diana q hit me, she already used her displacement ability so she didn't use it to see me. I Q'd diana Q and was able to melee me and kill me.