Openstack Client doenst use delimiters to download subfolders for object storage

Using `openstack container save <container>` to save container recursively returns:

[Errno 21] Is a directory: 'dir/'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/cliff/app.py", line 407, in run_subcommand
    result = cmd.run(parsed_args)
  File "/usr/lib/python3/dist-packages/osc_lib/command/command.py", line 39, in run
    return super(Command, self).run(parsed_args)
  File "/usr/lib/python3/dist-packages/cliff/command.py", line 186, in run
    return_code = self.take_action(parsed_args) or 0
  File "/usr/lib/python3/dist-packages/openstackclient/object/v1/container.py", line 195, in take_action
    self.app.client_manager.object_store.container_save(
  File "/usr/lib/python3/dist-packages/openstackclient/api/object_store_v1.py", line 160, in container_save
    self.object_save(container=container, object=object['name'])
  File "/usr/lib/python3/dist-packages/openstackclient/api/object_store_v1.py", line 410, in object_save
    with open(file, 'wb') as f:
IsADirectoryError: [Errno 21] Is a directory: 'dir/'
clean_up SaveContainer: [Errno 21] Is a directory: 'dir/'

The current structure of the container is

+-------------------------------------------------------------+
| Name |
+-------------------------------------------------------------+
| dir/ |
| dir/subdir/ |
| dir/subdir/file |
+-------------------------------------------------------------+