It seems that the bugg is not specific to the Proofread extension:

It seems to me that our wiki is ignoring all pages in the MediaWiki namespace and using a default instead

(from Scriptorium)

Sorry this hasn't received any attention yet.
Specific steps to reproduce are welcome which allow someone else to click / follow the steps and see the same results.

All this happens only in https://no.wikisource.org.

I first write the easier example: it doesn't exist a link to "Project:Kontoret" in the sidebar, despite of it is added to MediaWiki:Sidebar. In the default MediaWiki:Sidebar there should not exist any "Project:Kontoret" and that could be the reason for which we can not see that link: it is being used the default one?

The original bugg was more complex to explain, but it seems that the cause could be the same:

Try to edit any Index namespace page. E.g. https://no.wikisource.org/w/index.php?title=Indeks:Nansen,Fridtjof-Fram_over_Polhavet_I-1942.djvu&action=edit

We can see a form with the following 8 fields: Forfatter, Tittel, Utgivelsesår, Utgiver, Kilde, Omslagsbilde, Sider and Merknader.

Those 8 fields come from https://no.wikisource.org/wiki/MediaWiki:Proofreadpage_index_attributes which is deleted.

As long as "MediaWiki:Proofreadpage index data config" exists, the form has to show the fields of "MediaWiki:Proofreadpage index data config", not the fields of "MediaWiki:Proofreadpage_index_attributes".

Perhaps the software is not detecting the existence of "MediaWiki:Proofreadpage index data config" and assumes the default "MediaWiki:Proofreadpage_index_attributes"?

Thanks!

Hi! It seems that this bugg has been solved in no.wikisource. Plese, it can be closed as solved (it would be interesting to know how it was fixed). Best regards! -~~~~