(Android Firefox) Reader View issue - how to stop it from trying to download a page that was already downloaded.

Android 11 OnePlus 6T Firefox 156.0 Extensions: https everywhere, Privacy Badger, NoScript, uBlock Origin Tabs are set to never close. I downloaded several chapters from an online book I was reading prior to an appointment. I put each chapter into Reader View. Then I turned off WiFi access. This was about 2 hours prior to the appointment. I left Firefox on the regular view page I had loaded the chapters from. When I tried to read all the chapters, Reader View immediately tried to download the page and failed and gave me an error about my Internet connection. "Back" didn't work, all the previous downloaded, static pages were gone. I tested this at home. If you leave Firefox on a Reader View page and turn off WiFi access, the page is left as is. If you leave the page and return to it, the page is lost and needs to be downloaded again. Is there a setting or something to prevent this ... behavior? Thank you