Error converting docx to pdf

[CTPassion]

Hi,

I am running a unoserver as a subprocess from python in my docker container:

unoserver_process = subprocess.Popen(
        ['python', '-m', 'unoserver.server'],
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE
    )

Which works, and the unoconverter service starts up on port 2003. It converted one of my files but the other raises this error:

INFO:lib.filetype_conversion:   🛠️...Converting docx file to pdf
INFO:unoserver:Connecting.
INFO:unoserver:Converting.
ERROR:lib.filetype_conversion:❗Error converting file to PDF: <Fault 1: "<class 'RuntimeError'>:Could not load document <remote file> using the writer8 filter.">
ERROR:Worker:JOB FAILED
Traceback (most recent call last):
  File "/home/server/main.py", line 192, in <module>
    raise e
  File "/home/server/main.py", line 182, in <module>
    main(
  File "/home/server/main.py", line 74, in main
    if process_file(
       ^^^^^^^^^^^^^
  File "/home/server/main.py", line 107, in process_file
    pdf_content = filetype_conversion.convert_docx_to_pdf(content)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/server/lib/filetype_conversion.py", line 68, in convert_docx_to_pdf
    output_byte_str = CLIENT.convert(indata=input_stream.read(), outpath=None,
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/unoserver/client.py", line 142, in convert
    result = proxy.convert(
             ^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/xmlrpc/client.py", line 1122, in __call__
    return self.__send(self.__name, args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/xmlrpc/client.py", line 1461, in __request
    response = self.__transport.request(
               ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/xmlrpc/client.py", line 1166, in request
    return self.single_request(host, handler, request_body, verbose)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/xmlrpc/client.py", line 1182, in single_request
    return self.parse_response(resp)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/xmlrpc/client.py", line 1351, in parse_response
    return u.close()
           ^^^^^^^^^
  File "/usr/lib/python3.12/xmlrpc/client.py", line 668, in close
    raise Fault(**self._stack[0])
xmlrpc.client.Fault: <Fault 1: "<class 'RuntimeError'>:Could not load document <remote file> using the writer8 filter.">
INFO:lib.filetype_conversion:🤖 Terminating unoserver...

I am getting this error that it can't load document on some of my docx files, but I can't tell why, they seem intact to me. Any ideas what I should try? I can't upload the docx files for privacy reasons.

[regebro]

Can Libreoffice open those files normally?