Thumbnail of Ghost Friends are Missing or Disappear

I noticed this in the Supernatural expansion pack. Your Sim meets some ghosts, but when they are not in the same lot as your Sim anymore, their thumbnail picture disappears from your Sim’s acquaintances panel. You can still call them by doing the ‘Call Sim’ option on your phone. But I click on the thumbnail image as a shortcut to calling them or inviting them over. And this bug is very annoying!