Proofread status is not shown on index for some pages, mainly if a page was not edited since 2012 (but also for some newer pages), eg.:
https://pl.wikisource.org/wiki/Strona:PL_Nowodworski-Encyklopedia_koscielna_T.5_001.jpeg
https://pl.wikisource.org/wiki/Strona:PL_Nowodworski-Encyklopedia_koscielna_T.5_011.jpeg
https://pl.wikisource.org/wiki/Strona:PL_Nowodworski-Encyklopedia_koscielna_T.5_470.jpeg
The index page is:
https://pl.wikisource.org/wiki/Indeks:Encyklopedia_ko%C5%9Bcielna_(tom_V)
A page status became displayed after the page is null-edited (the null-edit is non-null in fact). Tested on
https://pl.wikisource.org/wiki/Strona:PL_Nowodworski-Encyklopedia_koscielna_T.5_003.jpeg
Some backward compatibility problem in proofreadpage?
{F23072597}
(in response to Billinghurst's request for a checklist) Add to the checklist and fill it in once the pages on each wiki have been refreshed:
[ ] bn
[ ] cs
[x] de
[ ] en
[ ] fr
[ ] hu
[x] it
[ ] kn
[x] pl
[x] sources
[ ] te
[ ] zh