On Feb 15, 2018 the German In the News story about Christoph_Ransmayr has an extra space at the beginning of the (HTML) text.
Local endpoint: http://localhost:6927/de.wikipedia.org/v1/page/news
This is because https://de.wikipedia.org/api/rest_v1/page/html/Vorlage:Hauptseite_Aktuelles/174045932 refers to a picture floating on the right. Here's a shortened version of the Parsoid HTML:
<li id="mwDg"> <span style="float:right; padding-top:0.6em; padding-left:0.5em;"> <figure-inline> <a href="./Datei:Porträt_Christoph_Ransmayr_Foto_Johannes_Cizek_14_5KB.jpg"> <img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Portr%C3%A4t_Christoph_Ransmayr_Foto_Johannes_Cizek_14_5KB.jpg/122px-Portr%C3%A4t_Christoph_Ransmayr_Foto_Johannes_Cizek_14_5KB.jpg" data-file-width="283" data-file-height="188" data-file-type="bitmap" height="81" width="122" /> </a> </figure-inline> </span> Dem österreichischen Schriftsteller <a rel="mw:WikiLink" href="./Christoph_Ransmayr" title="Christoph Ransmayr" id="mwEw">Christoph Ransmayr</a><span typeof="mw:Entity" id="mwFA"> </span><small id="mwFQ">(Bild)</small> ist der <a rel="mw:WikiLink" href="./Kleist-Preis" title="Kleist-Preis" id="mwFg">Kleist-Preis</a> zuerkannt worden. </li>
Just removing the <figure-inline> element is unfortunately not enough. The square would still show up.