Hi. While I am aware that there are some issues regarding export of pages from he.wikisource to book form, for most pages export to PDF works just fine, even with the special fonts and diacriticals.
One specific page, however, fails to download to PDF, namely:
https://he.wikisource.org/wiki/%D7%AA%D7%94%D7%9C%D7%99%D7%9D_%D7%A1%D7%A4%D7%A8_%D7%97%D7%9E%D7%99%D7%A9%D7%99/%D7%98%D7%A2%D7%9E%D7%99%D7%9D
After clicking "download to PDF", this page takes a very long time and then leads to the page https://ws-export.wmcloud.org/?format=pdf&lang=he&page=%D7%AA%D7%94%D7%9C%D7%99%D7%9D_%D7%A1%D7%A4%D7%A8_%D7%97%D7%9E%D7%99%D7%A9%D7%99/%D7%98%D7%A2%D7%9E%D7%99%D7%9D with a message at the top saying that the download has failed. I have tried many times. I've also tried downloading from that page as PDF on A4 paper, and the download fails that way too.

Other highly similar pages that are just as long and just as complicated nevertheless download just fine, with all the right fonts and sizes and diacriticals, for instance:

1. https://he.wikisource.org/wiki/%D7%AA%D7%94%D7%9C%D7%99%D7%9D_%D7%A1%D7%A4%D7%A8_%D7%A8%D7%90%D7%A9%D7%95%D7%9F/%D7%98%D7%A2%D7%9E%D7%99%D7%9D
2. https://he.wikisource.org/wiki/%D7%AA%D7%94%D7%9C%D7%99%D7%9D_%D7%A1%D7%A4%D7%A8_%D7%A9%D7%A0%D7%99/%D7%98%D7%A2%D7%9E%D7%99%D7%9D