[GAMEPLAY] Twin Shadows active will not return if you go too far

Recently when I've played support, I will usually buy Twin Shadows .I have noticed when using it that if I send out the ghosts and recall, or walk too far away, that a ghost will disappear. Instead of going all the way back to me, it will disappear midway and the cooldown will not be reduced.

Steps to Reproduce:

1. Use Twin Shadows Active.
2. Recall or walk far away from your starting point.
3. Any Ghosts that do not spot an enemy will return to you.
4. On the way back, the Ghost(s) will disappear and you will not receive the cooldown reduction that comes with it.

I noticed this twice so far, as two separate champions (Karma and Soraka ) with different builds. I do not have any current proof of this video, but it can be really annoying when my team (and myself) don't have the full map warded as much as I'd like.