Converting docx is not showing tracked changes when create pdf via api

I believe this is a change in behavior from the API but I'm having a hard time pinpointing when.

This FAQ says that pdf conversion will show tracked changes as they appear in Word: https://developer.adobe.com/document-services/faq/tech-support/#features---pdf-services-api-tracked-changes-and-comment-support-what-happens-to-any-tracked-changes-and-comments-in-the-doc-or-docx-files

However when using the Pdf Services SDK to convert a docx file to a pdf those the change tracking markup is not shown. It does show that markup if you convert the file using the free adobe online pdf conversion tool here: https://www.adobe.com/acrobat/online/word-to-pdf.html

Is there a way to force the same conversion process when calling via API?