Hi everyone.
I did a search and found one thread from 2014 raising this issue (there must be others but I didn't find them).
The issue being that my bookmarks show up in the Bookmark pane in Adobe but only the Chapter pane in preview.
My guess is it's an Apple peculiarity, but maybe not.
are there any other pdf readers for the mac that you can test your pdf file on? This will help to narrow the issue down to the pdf reader or scribus.