subiquity installer crashed on FCP/multipath installation

While doing a 21.04 installation (with the ISO from April 19th) I get the following error/crash:

fheimes@T570:~$ ssh installer@hwe0006
The authenticity of host 'hwe0006 (10.245.236.26)' can't be established.
ECDSA key fingerprint is SHA256:1ZZGtiJW1K8JmiJ4UYvEwLQTdwOd4W6/GccRhTN+KW8.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'hwe0006,10.245.236.26' (ECDSA) to the list of known hosts.
installer@hwe0006's password:
Welcome to Ubuntu Hirsute Hippo (development branch) (GNU/Linux 5.11.0-14-generic s390x)

 * Documentation: https://help.ubuntu.com
 * Management: https://landscape.canonical.com
 * Support: https://ubuntu.com/advantage

  System information as of Mon Apr 19 15:34:03 UTC 2021

  System load: 1.09 Memory usage: 14% Processes: 115
  Usage of /home: unknown Swap usage: 0% Users logged in: 0

  => There were exceptions while processing one or more plugins. See
     /var/log/landscape/sysinfo.log for more information.

0 updates can be installed immediately.
0 of these updates are security updates.

The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

connecting...
generating crash report
report saved to /var/crash/1618846572.935321808.ui.crash
Traceback (most recent call last):
  File "/snap/subiquity/2381/usr/bin/subiquity", line 33, in <module>
    sys.exit(load_entry_point('subiquity==0.0.5', 'console_scripts', 'subiquity-tui')())
  File "/snap/subiquity/2381/lib/python3.6/site-packages/subiquity/cmd/tui.py", line 142, in main
    subiquity_interface.run()
  File "/snap/subiquity/2381/lib/python3.6/site-packages/subiquity/client/client.py", line 363, in run
    super().run()
  File "/snap/subiquity/2381/lib/python3.6/site-packages/subiquitycore/tui.py", line 369, in run
    super().run()
  File "/snap/subiquity/2381/lib/python3.6/site-packages/subiquitycore/core.py", line 128, in run
    raise exc
  File "/snap/subiquity/2381/usr/lib/python3.6/asyncio/events.py", line 145, in _run
    self._callback(*self._args)
  File "/snap/subiquity/2381/lib/python3.6/site-packages/subiquitycore/async_helpers.py", line 26, in _done
    fut.result()
  File "/snap/subiquity/2381/lib/python3.6/site-packages/subiquitycore/context.py", line 148, in decorated_async
    return await meth(self, **kw)
  File "/snap/subiquity/2381/lib/python3.6/site-packages/subiquity/client/controllers/ssh.py", line 114, in _fetch_ssh_keys
    self.ui.body.confirm_ssh_keys(
AttributeError: 'ProgressView' object has no attribute 'confirm_ssh_keys'
Connection to hwe0006 closed.

Please see attached the content of /var/log and /var/crash