[out:xml][timeout:3600]; ( relation(57533)['wikidata'='Q21694746']['wikipedia'='en:Wiltshire']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch']
[out:xml][timeout:3600]; ( node(2477075193)['information'='board']['wikidata'='Q7036957']; ); (._;>;); out meta qt;//['information board with wikidata tag, not subject:wikidata']
[out:xml][timeout:3600]; ( node(10004370947)['species:wikipedia'='Quercus_robur']; node(11008373106)['species:wikipedia'='Quercus_robur']; ); (._;>;); out meta qt;//['malformed secondary wikipedia tag - for species 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.