1. Create 2 guests.
# virsh list --all
 Id   Name    State
------------------------
 -    test2   shut off
 -    test3   shut off
2.  Run virt-clone with --replace option.
# virt-clone -o test3 -n test2 --replace --auto-clone --debug
3.  Check the result.
[Mon, 28 Oct 2024 23:22:29 virt-clone 53351] DEBUG (cloner:569) Duplicate failed: Could not remove old vm 'test2': Requested operation is not valid: cannot undefine domain with nvram
[Mon, 28 Oct 2024 23:22:29 virt-clone 53351] DEBUG (cli:256)   File "/usr/bin/virt-clone", line 8, in <module>
    virtclone.runcli()
  File "/usr/share/virt-manager/virtinst/virtclone.py", line 209, in runcli
    fail(main_e)
  File "/usr/share/virt-manager/virtinst/cli.py", line 256, in fail
    log.debug("".join(traceback.format_stack()))

[Mon, 28 Oct 2024 23:22:29 virt-clone 53351] ERROR (cli:257) Could not remove old vm 'test2': Requested operation is not valid: cannot undefine domain with nvram
[Mon, 28 Oct 2024 23:22:29 virt-clone 53351] DEBUG (cli:259) 
Traceback (most recent call last):
  File "/usr/share/virt-manager/virtinst/virtclone.py", line 203, in runcli
    sys.exit(main())
             ^^^^^^
  File "/usr/share/virt-manager/virtinst/virtclone.py", line 194, in main
    cloner.start_duplicate(cli.get_meter())
  File "/usr/share/virt-manager/virtinst/cloner.py", line 555, in start_duplicate
    _replace_vm(self.conn, self._new_guest.name)
  File "/usr/share/virt-manager/virtinst/cloner.py", line 46, in _replace_vm
    raise RuntimeError(msg) from None
RuntimeError: Could not remove old vm 'test2': Requested operation is not valid: cannot undefine domain with nvram