Ward Vision Misrepresented/Bugged

So I had some interesting ward issues the other day playing on Red side. The enemy team was threatening Baron, and we were barely able to push out of our base. On the way out, I attempted to ward in the bush between mid and Red, only to get what appeared to be half-vision from the ward.

I decided to run a quick test on the same spot of the bush on Blue Side in the Practice Tool, and discovered what is shown in the picture. The ward itself doesn't light up the area of the map, but it appears to still give vision (though darkened) of enemy champions. There is another Enemy Dummy further out (around the other end of Raptor wall, closer to River), so you can see that it's not a case where dummies are always visible or something.

One way or another, this should be clarified...

If anyone wants further evidence, I'd be more than happy to create a video showing the same thing! :)

EDIT: Video incoming - it's easier to explain the issue in a video anyway.

EDITx2: Here's the video: https://youtu.be/HjYfZd0uk_0

I try to explain it as well as I can, and apparently my mic is acting funky, but I think the visuals explain it pretty well even without solid commentary.