[out:xml][timeout:3600]; ( relation(105073)['wikidata'='Q23047573']['wikipedia'='de:Landesfestung Ingolstadt']; way(168959395)['wikidata'='Q435363']['wikipedia'='de:Deutsches Medizinhistorisches Museum (Ingolstadt)']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch']
[out:xml][timeout:3600]; ( relation(7690346)['wikidata'='Q122870674']['wikipedia'='de:Schnellfahrstrecke Nürnberg–Ingolstadt–München']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch - wikipedia points to disambiguation page and wikidata does not']
[out:xml][timeout:3600]; ( relation(4095769)['network:wikidata'='Q99937594']['not:network:wikidata'='Q99937594']; ); (._;>;); out meta qt;//['wikipedia/wikidata type tag that is incorrect according to not:* tag']
[out:xml][timeout:3600]; ( relation(16309915)['network:wikidata'='Q99937594']['network:wikipedia'='de:Ingolstädter Verkehrsgesellschaft']; relation(16309916)['network:wikidata'='Q99937594']['network:wikipedia'='de:Ingolstädter Verkehrsgesellschaft']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch - for network 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.