Open The Works of Reverend John Howe, Volume 1; go to page xv where there are some footnotes marked by a * and a †. You can hover over them and see the footnotes pop up, but if you turn on "Show footnotes on page" and go into paged view (1 column or more) the footnotes do not appear on the bottom of the page. Similarly, if you go into Print/Export you cannot see the footnotes on the bottom of the page in the print preview window, and they do not print or export.
One user reported this problem on UserVoice and thought it was because these footnote markers were not numerical. But I have a PB with non-numerical footnote markers and they export and print fine and show up on the bottom of the page in paged view. So it must be an issue with the tagging in this particular resource.