//As a Wikisource user, I want the subpages bug fixed, so that I can see the full contents of the book in my ebook export.
//
**Background:** I have found a few Wikisource books where only the front page gets exported, but not the subpages. This only happens at the moment on wsexport-test. It does not happen on production. This is potentially due to our work in T264788.
**Books to reproduce problem:**
*** Example 1:
**** Test version (only shows subpages): https://wsexport-test.wmflabs.org/?lang=pa&page=%E0%A8%AA%E0%A9%B0%E0%A8%9C%E0%A8%BE%E0%A8%AC%E0%A9%80_%E0%A8%95%E0%A9%88%E0%A8%A6%E0%A8%BE_%28%E0%A8%9A%E0%A8%B0%E0%A8%A8_%E0%A8%AA%E0%A9%81%E0%A8%86%E0%A8%A7%E0%A9%80%29&format=epub-3&fonts=
**** Production version (shows all pages): https://wsexport.wmflabs.org/?lang=pa&page=%E0%A8%9C%E0%A9%82%E0%A8%B2%E0%A9%80%E0%A8%85%E0%A8%B8_%E0%A8%B8%E0%A9%80%E0%A8%9C%E0%A8%BC%E0%A8%B0&format=epub-3&fonts=
*** Example 2:
**** Test version (only shows subpages): https://wsexport-test.wmflabs.org/?lang=pa&page=%E0%A8%AC%E0%A9%81%E0%A8%9D%E0%A8%A6%E0%A8%BE+%E0%A8%A6%E0%A9%80%E0%A8%B5%E0%A8%BE&format=epub-3&fonts=
**** Production version (shows all pages): https://wsexport.wmflabs.org/?lang=pa&page=%E0%A8%AC%E0%A9%81%E0%A8%9D%E0%A8%A6%E0%A8%BE+%E0%A8%A6%E0%A9%80%E0%A8%B5%E0%A8%BE&format=epub-3&fonts=
**Acceptance Criteria:**
* Restore previous download behavior, so all pages are properly exported (rather than just the subpages)