I can confirm this bug. It's frustrating that those extra directories don't appear in Amarok's collections, though. You can right-click->show hidden folders in Konqueror, but not in Amarok. I still think it's a valid bug, because the user is not given a way to access those files.
Ideally, right-click->show hidden folders would allow directories such as /mnt to become visible in Amarok's collections.
I can confirm this bug. It's frustrating that those extra directories don't appear in Amarok's collections, though. You can right-click->show hidden folders in Konqueror, but not in Amarok. I still think it's a valid bug, because the user is not given a way to access those files.
Ideally, right-click->show hidden folders would allow directories such as /mnt to become visible in Amarok's collections.