My bot is unable to save pages via the API (standard wikitext pages) and pywikibot throws the error:
pywikibot.exceptions.PageNotSaved: [[wikidata:Wikidata:Database reports/Popular properties]]: internal_api_error_MWException: Exception Caught: No handler for model 'wikibase-query'' registered in $wgContentHandlers
Version: unspecified
Severity: major