There is, frankly, a lot of that on the Dutch language Wikipedia (don't get me started). Partly this seems to happen because a lot of educated Dutch simply skip it entirely and just use and contribute to the much larger English language Wikipedia.
There is also a very strong culture of hiding behind [citation needed]. Even if something is factually wrong, as long as you can't present a multitude of reliable¹ sources, the old name stays, even if it is glaringly obvious that it is not in current use.
1: What constitutes 'reliable' is of course defined by the Wikipedians who can simply put in more time than any casual contributor to hold of such changes.
Ugh, yeah, the discussion[0] on this is rather pigheaded. They almost seem to go out of their way to keep it racist.
[0] https://nl.wikipedia.org/wiki/Overleg:Negerzoen