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Order by pages number doesn't work anymore :

https://fr.wikisource.org/w/index.php?title=Sp%C3%A9cial:IndexPages&limit=500&offset=0&key=incategory%3A%22Livres_termin%C3%A9s%22&order=size

https://fr.wikisource.org/w/index.php?title=Sp%C3%A9cial:IndexPages&limit=500&offset=500&key=incategory%3A%22Livres_termin%C3%A9s%22&order=size

But manually it's ok 

https://fr.wikisource.org/w/index.php?title=Sp%C3%A9cial:IndexPages&limit=800&key=incategory%3A%22Livres_termin%C3%A9s%22&order=size

I believe that it isn't a new issue. The sort has ever been done inside of "pages" created by the search engine.