There's another bug, if you see someone, fly away from them, (upwards of 50k) they still stay on your scanners. I've jumped to other systems and had them still be there, abit "Far" away.
It's not just on scanners, this "ghost" ship is actually there. You can fly towards it and shoot it, but it won't do anything. So if something messes up during a jump and then the actual player whose ship you see as ghost comes back to you, you can see him twice.