duplicate external hdd "mounted" icon remains on desktop when volume is removed.

Issue Description

Since 4.20 update, when I unlock an encrypted external hdd and mount my filesystem (btrfs),

cryptsetup luksOpen /dev/sdb1 archive
mount -o subvol=archive /dev/mapper/archive /mnt/usb/archive

two icons (with the label of the filesystem "ARCHIVE") appears on the desktop instead of one.

When the filesystem is unmounted and safely removed, one "mounted" icon with the label "ARCHIVE" remains on the desktop although the volume is not present anymore.

Expected Behavior

When the volume is mounted, only one icon should show up.

When it is unmounted and safely removed, no icon should remain on the desktop.

Additional Information

fstab entry for the external hdd

UUID=29b18e67-f0c7-4d1a-b7c7-01a58fa4156b /mnt/usb/archive        btrfs   noauto,nofail,user,exec,relatime,rw,x-gvfs-show,x-gvfs-name=ARCHIVE,subvol=archive      0 0

I can reproduce the issue with a brand new user "test" and no previous xfce configuration.

Environment & Versions

• OS distribution and version: Gentoo
• Overall Xfce version: 4.20
• xfdesktop version (git hash if not a release): 4.20.0
• Windowing system (X11/Wayland): X11
• Compositor and version (if Wayland): N/A
• GTK Theme: Arc-Theme
• Icon Theme: Arc-Icon-Theme
• UI Scale Factor: 1x