I think it has something to do with the fact that camera app and potos app are both actually mobileslideshow.app and ipod is actually mobilemusicplayer.app.
It's not really a bug, but something that the dev Nate True probably oversaw or just couldn't figure out.
It's a shame, that he seems to have stopped working on this.
Dock & Quickgold are by far my favorite tools.
Launch your first app from quickgold, and from there you just switch from app to app with dock. And with backgrounder installed, this is like switching from space to space on leopard! (Well kinda... but still hot enuff!)
You could do what I did: install Stacks and put those apps in there, so you can always quicklaunch them without having them clogging up your springboard. You'll still have the problem with dock not showing those apps.
Or you could just terrorize Nate True on his blog or twitter or whatever and get him to further develope this
Actually this seems to be the best plan!