PSA: Control (aka, Pink) Wards disable Stealth (aka Green) Wards. This means that the Stealth stops giving vision.

I'm not sure why, but for some reason this change was not well communicated to the lower ELOs of this gam The new pink wards effectively turn green wards off.

The amount of dragons, barons, and games I've lost from people getting picked off attacking stealth wards is to damn high. I'm hoping this post helps.