Obvious non-repeating header removed

I have requirement to convert PDF to markdown for LLM processing. In many PDFs, It does fantastic job of removing header/footers which needs to be removed.

However in one PDF, all obvious top headings are removed (non repeating) as header/footer which is major issue. Here is the PDF - https://www.airlinepilotcentral.com/files/republiccontract.pdf.

Start by reproducing PDF-to-Markdown conversion with the linked republiccontract.pdf and compare the output with the attached image. Trace the header/footer removal behavior involved in that conversion; done means non-repeating top headings are retained while genuine repeating headers and footers continue to be removed.

Written by the indexing model from the issue text.