btrfs mounts in raid1 are shown twice

BTRFS raid1 devices consist of two /dev/sdx nodes, and either can be used to mount the filesystem. One is used to mount each raid1 btrfs filesystem in /etc/fstab. However, nautilus, or possibly some underlying abstraction, decides that each /dev/sdx node must be a different file system, so nautilus shows me double the number of devices. One is marked unmounted and one is already mounted. Clicking on the unmounted one mounts a duplicate.

Expected: each BTRFS raid1 file system should only be shown once in nautilus.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: nautilus 1:3.2.1-0ubuntu3.1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Tue Nov 15 11:46:04 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/nautilus
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: Upgraded to oneiric on 2011-09-06 (69 days ago)
XsessionErrors:
 (dropbox:2588): Gdk-CRITICAL **: IA__gdk_window_thaw_toplevel_updates_libgtk_only: assertion `private->update_and_descendants_freeze_count > 0' failed
 (gnome-settings-daemon:2550): libappindicator-WARNING **: Unable to connect to the Notification Watcher: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.69 was not provided by any .service files
 (gnome-settings-daemon:2550): libappindicator-WARNING **: Unable to connect to the Notification Watcher: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.244 was not provided by any .service files
 (evince:9177): Gtk-WARNING **: Unable to retrieve the file info for `file:///home/jack/Documents/Projects/Saab%20Sarandos%20bills%20and%20MD%20certificate/SETTLEMENT%20AGREEMENT%20AND%20RELEASE.3.pdf': Error stating file '/home/jack/Documents/Projects/Saab Sarandos bills and MD certificate/SETTLEMENT AGREEMENT AND RELEASE.3.pdf': No such file or directory