Akali gets revealed (while in her W) by 3v3's Arcane Sweeper

When using the 3v3-trinket (Arcane Sweeper) onto Akali while she is in her W, she gets revealed. This shouldn't happen because she is invisible there and should only be revealed by enemy turrets.

How to reproduce:

1. You need 2 people.
2. Go in custom Twisted Treeline game.
3. Pick Akali.
4. Wait about 90 seconds and use Arcane Sweeper on Akali that is in her W.

Reproducable 100%. (2/2 times happened to me)

Please fix. :)