[out:xml][timeout:3600]; ( way(25769322)['wikidata'='Q76635906']['wikipedia'='de:Norddeutsche Wollkämmerei & Kammgarnspinnerei']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch']
[out:xml][timeout:3600]; ( relation(16879705)['brand:wikidata'='Q246; Q20165']; ); (._;>;); out meta qt;//['malformed secondary wikidata tag - for brand prefixed tags']
JOSM Wikipedia plugin
Note to self: online version hosted at https://matkoniecz.github.io/OSM-wikipedia-tag-validator-reports, files are stored at https://github.com/matkoniecz/OSM-wikipedia-tag-validator-reports.