you are opening the properties of a volume in the computer location in one case and the properties of the directory where the volume is mounted in the other case, those are represented differently in nautilus, they have different icons and they are different objects, that really doesn't seem to be a bug
you are opening the properties of a volume in the computer location in one case and the properties of the directory where the volume is mounted in the other case, those are represented differently in nautilus, they have different icons and they are different objects, that really doesn't seem to be a bug