[out:xml][timeout:3600]; ( way(472092999)['wikipedia'='de:Hedelius Maschinenfabrik']; way(863494979)['wikipedia'='de:Wacholderheide (Lingen)']; way(863501962)['wikipedia'='de:Wacholderheide (Lingen)']; ); (._;>;); out meta qt;//['wikipedia tag links to 404']
[out:xml][timeout:3600]; ( node(4374710627)['wikidata'='Q2638918']; ); (._;>;); out meta qt;//['should use a secondary wikipedia tag - linking from wikipedia and wikidata tag to a human']
[out:xml][timeout:3600]; ( way(258476957)['wikipedia'='de:Aldi']; ); (._;>;); out meta qt;//['blacklisted connection with known replacement']
[out:xml][timeout:3600]; ( relation(1130531)['operator:wikidata'='Q124369334']['operator:wikipedia'='de:Avacon']; relation(2309723)['operator:wikidata'='Q124369334']['operator:wikipedia'='de:Avacon']; relation(2309739)['operator:wikidata'='Q124369334']['operator:wikipedia'='de:Avacon']; way(32042992)['operator:wikidata'='Q1662830']['operator:wikipedia'='de:Tennet Holding']; way(797024987)['operator:wikidata'='Q1662830']['operator:wikipedia'='de:Tennet Holding']; way(797024990)['operator:wikidata'='Q1662830']['operator:wikipedia'='de:Tennet Holding']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch - for operator 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.