I assume AnyDVD overwrites/suppresses/whatever the playlists line when I mount a ripped iso.
I think AnyDVD should still display this line, so for me is this a bug.
Yes, it's been mentioned a few times over the last couple of years about this.
I've suggested AnyDVD shouldn't overwrite/create the 'disc.inf' if there is one already present (or at least retain playlist info)
If I remember right developers didn't see it as a bug and this is intended - the fix was just disable AnyDVD on your virtual drive if using unprotected/already processed ISO images.
I'd be interested to see what @Pete thinks about it now.