Bookmarks are stripped when printing to pdf creator as pdf/a

When printing a pdf with bookmarks to pdf creator printer as PDF/A the bookmarks are removed. Trying to find another option other than full version Adobe to produce pdf/a but need to maintain bookmarks. Any suggestions?

I am not sure if this helps but please try to drag & drop the PDF onto the main PDFCreator window or the PDFCreator.exe.
This will start a “direct” conversion without converting the PDF to Postscript in the first step and might be able to preserve the bookmarks.