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Category graph is missing lots of categories
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I’ve only looked at this sporadically so far, but the category graph in the Wikidata Query Service seems to be missing a lot of categories. For example:

  SERVICE <> {
    BIND(<> AS ?category)
    ?category mediawiki:subcategories ?subcategories.
    ?subcategory mediawiki:isInCategory ?category.

That’s only six subcateries, rather than the 25 indicated by the mediawiki:subcategories triple (which matches the number on the category page).