[Gameplay] - Control Ward Not Disabling Normal Ward.

I've noticed that sometimes a control ward can give vision of a normal ward being placed but doesn't disable the ward. The video above gives an example of this the control ward sees the normal ward get placed down but does not disable it. The lee sin wards my blue and the control ward sees the ward being placed, I walk over to go disable it but it goes invisible.

The place I've noticed it the most is in bottom lane in the bushes if your control ward is placed close to your side and the enemy wards close to their side, the control ward will see it get placed and not disable it.

I'm pretty sure this is a bug because I thought that the sight range and the disable range would be the same.