volume backup show fails when backup is identified by name

This is on a Dalmatian Devstack.

$ openstack volume backup list -c ID -c Name
+--------------------------------------+------------+
| ID | Name |
+--------------------------------------+------------+
| f5d02a9f-1324-456d-8728-4bbe585930d6 | incbackup1 |

$ openstack volume backup show incbackup1
No Backup found for incbackup1: Client Error for url: http://192.168.1.200/volume/v3/$PROJECT/backups/incbackup1, Backup incbackup1 could not be found.
$ openstack volume backup show f5d02a9f-1324-456d-8728-4bbe585930d6
+-----------------------+--------------------------------------+
| Field | Value |
+-----------------------+--------------------------------------+
| availability_zone | nova |
...
$ openstack --version
openstack 7.1.3

The --debug option confirms that the openstack client issues an incorrect API, i.e.
GET http://192.168.1.200/volume/v3/$PROJECT/backups/incbackup1, although the API requires a UUID, not a name.