I recently run into the same kind of problem in Wikidata.
https://www.wikidata.org/wiki/Wikidata_talk:WikiProject_Onto...
typical problem is of "light rail (Q1268865) is data visualization (Q6504956)" kind - this specific is fixed, but there are many similar
https://www.wikidata.org/wiki/Wikidata:Project_chat/Archive/...
https://www.wikidata.org/wiki/Wikidata:Project_chat#Ontology...