Issue with --convert-to pdf, missing TOC

Hi good folks,
I am hoping for help with converting documents to pdf.

I have a problem with one specific docx file.

Open in LibreOfficePortable UI, click the export to PDF - works great.
But if i try to run the convert using command prompt - i get the same document, only the TOC (table of content) is missing completely. There is blank space where it should be.

I am using LibreOfficePortable 4.0.3, and I can confirm lots of other documents convert easily with no problem including TOC.

Any help is appreciated, not sure if I can upload the docx file so you could see for yourselves what the problem is.