GNOME desktop confused by RAID-1 volume

[Michael Schwendt]

Recently, I've noticed that after logging in, a RAID-1 volume is
displayed two times. The same two hdd icons, the same Name, the same
"Properties" are displayed.

When I choose "Unmount Volume" via the context menu, the second icon
stays on the desktop. All its details in the properties dialog change
to "Volume: home", and indeed the details for my /home partition are
displayed. The "Name" is wrong though, as it's still the size of the
RAID-1 volume. When I want to unmount the volume (just as a test) I'm
asked "Do you want to empty the trash before you umount?" and the
dialog explains what that would yield. If I choose not to empty the
trash and proceed, there is an error dialog "Cannot unmount volume -
The volume is not mounted" (sure, it's /home). When I mount the RAID-1
volume again, both desktop icons refer to it again.

Some desktop component gets confused.