Hello,
I've investigated a little further. It is not due to one of my settings.
But it could be an issue from Koreader, as I can see.
For example, I can get all the full and correct epub for the wikipedia article "Jérusalem" in French.
But for the wikipedia article "Jérusalem" in Engish, the epub ends just after the first title "Etymology and names".
The two articles have a first chapter on Etymology and just after the title of this chapter, there is an hyperlink to open a detailed article. But the writing of this hyperlink is different in the two versions(see below).
Maybe Koreader misinterprets this link in the English version.
In this English article, the source code is :
<h2><span class="mw-headline" id="Etymology_and_names">Etymology and names</span></h2>
<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1033289096"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="https://en.wikipedia.org/wiki/Names_of_Jerusalem" title="Names of Jerusalem">Names of Jerusalem</a></div>
The code source of the French article is :
<h2><span id=".C3.89tymologie_et_d.C3.A9nominations"></span><span class="mw-headline" id="Étymologie_et_dénominations">Étymologie et dénominations</span></h2>
<div class="thumb tright"><div class="thumbinner" style="width:362px;"><a href="https://commons.wikimedia.org/wiki/File:Western_Wall_Panoramic.jpg?uselang=fr" class="image"><img src="./Jérusalem — Wikipédia_files/Western_Wall_Panoramic.jpg" decoding="async" width="360" height="132" class="thumbimage" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Western_Wall_Panoramic.jpg/540px-Western_Wall_Panoramic.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Western_Wall_Panoramic.jpg/720px-Western_Wall_Panoramic.jpg 2x" data-file-width="3276" data-file-height="1200"></a> <div class="thumbcaption"><div class="magnify"><a href="https://fr.wikipedia.org/wiki/Fichier:Western_Wall_Panoramic.jpg" class="internal" title="Agrandir"></a></div><a href="https://fr.wikipedia.org/wiki/Vieille_ville_de_J%C3%A9rusalem" title="Vieille ville de Jérusalem">Vieille ville</a> : panorama du <a href="https://fr.wikipedia.org/wiki/Mur_des_Lamentations" title="Mur des Lamentations">Mur occidental</a> (Mur des Lamentations) surmonté du <a href="https://fr.wikipedia.org/wiki/D%C3%B4me_du_Rocher" title="Dôme du Rocher">dôme du Rocher</a> et de la <a href="https://fr.wikipedia.org/wiki/Mosqu%C3%A9e_al-Aqsa" title="Mosquée al-Aqsa">mosquée al-Aqsa</a>.</div></div></div>
<div class="bandeau-container bandeau-section metadata bandeau-niveau-information"><div class="bandeau-cell bandeau-icone-css loupe">Article détaillé : <a href="https://fr.wikipedia.org/wiki/Noms_de_J%C3%A9rusalem" title="Noms de Jérusalem">Noms de Jérusalem</a>.</div></div>