rstfmt cannot handle "docutils.utils.SystemMessage: (ERROR/3) Unexpected indentation."

[oxmb]

I have this minimal file, with a unexpected indentation on line 3:

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
occaecat cupidatat non proident, sunt in culpa qui officia deserunt
 mollit anim id est laborum.

When I run rstfmt on this file, I get this error:

:3: (ERROR/3) Unexpected indentation.
Traceback (most recent call last):
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/parsers/rst/states.py", line 2798, in text
    block = self.state_machine.get_text_block(flush_left=True)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/statemachine.py", line 403, in get_text_block
    block = self.input_lines.get_text_block(self.line_offset,
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/statemachine.py", line 1352, in get_text_block
    raise UnexpectedIndentationError(self[start:end], source,
docutils.statemachine.UnexpectedIndentationError: (StringList(['occaecat cupidatat non proident, sunt in culpa qui officia deserunt'], items=[('', 1)]), '', 3)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/mb/.local/share/nvim/venv/bin/rstfmt", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/rstfmt/__main__.py", line 91, in main
    do_file(args, path, misformatted)
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/rstfmt/__main__.py", line 19, in do_file
    doc = rstfmt.parse_string(inp)
          ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/rstfmt/rstfmt.py", line 758, in parse_string
    parser.parse(s, doc)
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/parsers/rst/__init__.py", line 184, in parse
    self.statemachine.run(inputlines, document, inliner=self.inliner)
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/parsers/rst/states.py", line 169, in run
    results = StateMachineWS.run(self, input_lines, input_offset,
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/statemachine.py", line 233, in run
    context, next_state, result = self.check_line(
                                  ^^^^^^^^^^^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/statemachine.py", line 445, in check_line
    return method(match, context, next_state)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/parsers/rst/states.py", line 2801, in text
    msg = self.reporter.error('Unexpected indentation.',
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/utils/__init__.py", line 231, in error
    return self.system_message(self.ERROR_LEVEL, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/rstfmt/rstfmt.py", line 281, in system_message
    msg = super().system_message(level, message, *children, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mb/.local/share/nvim/venv/lib/python3.12/site-packages/docutils/utils/__init__.py", line 197, in system_message
    raise SystemMessage(msg, level)
docutils.utils.SystemMessage: :3: (ERROR/3) Unexpected indentation.