Versions 1.6+ file type conversion issues

[vladd-bit]

Libre office version : libreoffice4.24.2.7
Ubuntu version: 24.04 Noble
Unoserver version: 3.1

Trying to convert rtf/doc(x)/html/txt/html/odt -> pdf files fails

 loffice_subprocess = Popen(args=[LIBRE_OFFICE_PYTHON_PATH, "-m", "unoserver.converter",
                                                    doc_file_path, pdf_file_path,
                                                    "--interface", LIBRE_OFFICE_NETWORK_INTERFACE,
                                                    "--port", str(used_port_num), "--convert-to", "pdf"],
                                              cwd=TMP_FILE_DIR, close_fds=True, shell=False, stdout=PIPE, stderr=PIPE):

When using version 1.6 it works perfectly.