**Steps to reproduce**
1. Enable //Show previews without reloading the page// (“AJAX preview”) in your Wikisource preferences (e.g. [[https://wikisource.org/wiki/Special:Preferences#mw-prefsection-editing-preview|multilingual Wikisource]]).
2. Go to an already proofread page (e.g. [[https://wikisource.org/wiki/Page:Hærramek_ja_bæsstamek_Jesus_Kristus_ođđa_Testament.pdf/520|Page:Hærramek ja bæsstamek Jesus Kristus ođđa Testament.pdf/520]]).
3. Edit the page.
4. Without any changes, click Preview.
**Actual result**
5. The banner says //This page has not been proofread.//
**Expected result**
5. The banner says //This page has been proofread// (or whatever proofread status the chosen page has).
**Other information** (browser name/version, screenshots, etc.):
Changes shown when no changes were actually made:
{F35958903}
Other examples:
* https://en.wikisource.org/w/index.php?title=Page:Grimm-Rackham.djvu/27&action=edit
* https://pl.wikisource.org/w/index.php?title=Strona:PL_Boniecki_-_Herbarz_Polski_(1).djvu/10&action=edit