[out:xml][timeout:3600]; ( relation(16772336)['wikipedia'='de:de:Glashütte_(Stetten_am_kalten_Markt)']; ); (._;>;); out meta qt;//['malformed wikipedia tag']
[out:xml][timeout:3600]; ( relation(10601716)['wikidata'='Q490169']['wikipedia'='de:Andelsbach']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch - wikipedia points to disambiguation page and wikidata does not']
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.