I just asked to delete my user page on Wikidata so that it could pull from my Meta Wiki user page (through https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Extension:GlobalUserPage).
The problem is, Wikidata is unable to fetch the languages I speak from my page on Meta: https://www.wikidata.org/wiki/User:Pikolas
The bug can be reproduced with the steps above.