See https://en.wikipedia.org/wiki/Special:Interwiki; currently https://en.wikipedia.org/wiki/wikifunctions: is not valid.
This can be fixed by modifying https://gerrit.wikimedia.org/g/mediawiki/extensions/WikimediaMaintenance/+/9d78f1e499c004e8110d792b832b5dbec5ae8207/dumpInterwiki.php#328