WordPress Enable Mastodon Apps does not like `in_reply_to_id`

[jernst]

Needs investigation.

Traceback (most recent call last):
  File "/home/ubosdev/git/github.com/jernst/feditest/venv.linux.default/lib/python3.11/site-packages/feditest/testrun.py", line 240, in run
    self.test_step.test_step_function(test_instance)
  File "/home/ubosdev/git/github.com/jernst/feditest-contrib/../feditest-tests-fediverse/tests/system2/reply_single_hop.py", line 60, in receiver_replies_to_note
    self.reply_uri = self.receiver_node.make_reply_note(self.receiver_actor_acct_uri, self.note_uri, self.reply_content)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubosdev/git/github.com/jernst/feditest/venv.linux.default/lib/python3.11/site-packages/feditest/nodedrivers/mastodon/__init__.py", line 697, in make_reply_note
    response = mastodon_client.make_reply_note(to_be_replied_to_object_uri, reply_content)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubosdev/git/github.com/jernst/feditest/venv.linux.default/lib/python3.11/site-packages/feditest/nodedrivers/mastodon/__init__.py", line 311, in make_reply_note
    response = self.http_post('/api/v1/statuses', args)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubosdev/git/github.com/jernst/feditest/venv.linux.default/lib/python3.11/site-packages/feditest/nodedrivers/mastodon/__init__.py", line 227, in http_post
    return mastodon_api_invoke_post_or_put('POST', self._app.api_base_url, self._app.session, path, args=args, headers=self._auth_header)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubosdev/git/github.com/jernst/feditest/venv.linux.default/lib/python3.11/site-packages/feditest/nodedrivers/mastodon/__init__.py", line 172, in mastodon_api_invoke_post_or_put
    raise HTTPError(f'HTTP status { response.status_code }: { response.content.decode("utf-8") }', response=response)
requests.exceptions.HTTPError: HTTP status 400: {"error":"rest_invalid_param","error_description":"Invalid parameter(s): in_reply_to_id"}