Convert Word Document to PDF - Table of Contents Lose Link/Bookmarking

[nudsgn]

I created this flow in October 2019.  It grabs a selected word document (a draft software training guide) in one sharepoint document library and converts the guide to  a PDF and stores it in a different document library for our end users to read/download/print. The flow also updates the properties of the original word doc, so we know which documents need to be published based on date modified and date published. This has worked well for 2 years untouched.  Our word documents have links and linked table of contents in them.  We periodically update the word documents as our in-house software gets new features.

This week (3 Nov 2021) the converted PDF all of a no longer retains the table of contents bookmarking/linking in the PDF, but the links (ctrl+K) continue to work.  Upon seeing this issue, I switched from using OneDrive for Business to do the PDF conversion and tried the Word Document to PDF - Word Connector. Still the same issue. The file creates successfully as a PDF, but the PDF doesn't retain the bookmarking/linking from the Word Docx Table of Contents. 

??Has anyone else experienced this and does anyone have a solution? I would prefer to not have to pay for a third party service - as that requires a business case/approval etc, but I do see Adobe has an API now and Plumsail is a go to.