I have noticed that links inserted with the visual editor, if they are not applied to the full word (something usual in languages with declension) they create a line break with the <nowiki> tag.
You can see it happening in this oldid: https://eu.wikipedia.org/w/index.php?title=Marokoko_historia&oldid=6155769#Marokoko_historiaurrea with the word "Salen", if you have the correct screen resolution.