In some cases the browser version of an article that is linked below the article does not work. This also holds for the links to the article history and the discussion page. In all three links there is a surplus .m in the URLs as for example https://de.m.m.wikipedia.org/wiki/Arnstadt.

Steps to reproduce:

1. Google a keyword such as Arnstadt
2. Follow the suggested link to Wikipedia which opens the article in the Wikipedia App
3. Try to open the browser version of the article by clicking the link at the bottom of the article in the Wikipedia App. A link that is not available is opened by the browser

The error could be reproduced on a Samsung Galaxy tablet and Samsung A3 smartphone.