[Gameplay] Challenging Smite Vision

In-game description of Skirmisher's Sabre:

Passive - Challenging Smite: Smite can be cast on enemy champions, marking them for 6 seconds. While marked, basic attacks deal true damage over 3 seconds, you have vision of them, and their damage to you is reduced by 20%.

When I use challenging smite on champions that can stealth (e.g. Akali W or Shaco Q), the eyes will show on top of the champion; however, when they enter stealth they are not visible. When they exit stealth, they still have the visibility eyes.

This can be duplicated pretty easily. I hope it can be fixed, since part of the appeal of challenging smite is to help combat champions that utilize stealth.