Backups fail with latest version 0.8.19

I in the current version 0.8.19 the following error appear while using the backup_lvm role:

Traceback (innermost last):
  File \"/usr/local/bin/duplicity\", line 87, in <module>
    with_tempdir(main)
  File \"/usr/local/bin/duplicity\", line 70, in with_tempdir
    fn()
  File \"/usr/local/lib/python3.9/site-packages/duplicity/dup_main.py\", line 1529, in main
    action = commandline.ProcessCommandLine(sys.argv[1:])
  File \"/usr/local/lib/python3.9/site-packages/duplicity/commandline.py\", line 1217, in ProcessCommandLine
    backup, local_pathname = set_backend(args[0], args[1])
  File \"/usr/local/lib/python3.9/site-packages/duplicity/commandline.py\", line 1088, in set_backend
    config.backend = backend.get_backend(bend)
  File \"/usr/local/lib/python3.9/site-packages/duplicity/backend.py\", line 223, in get_backend
    obj = get_backend_object(url_string)
  File \"/usr/local/lib/python3.9/site-packages/duplicity/backend.py\", line 209, in get_backend_object
    return factory(pu)
  File \"/usr/local/lib/python3.9/site-packages/duplicity/backends/b2backend.py\", line 107, in __init__
    (self.path, bucket_name, self.service.account_info.get_minimum_part_size()), log.INFO)
 AttributeError: 'InMemoryAccountInfo' object has no attribute 'get_minimum_part_size'

As a workaround one can just use version 0.8.18.