It appears that there's an error when attempting to obtain oresscores for some revisions.
$ curl -H "Accept: application/json" 'https://en.wikipedia.org/w/api.php?action=query&prop=revisions&titles=Facebook&rvprop=ids|oresscores&format=json' {"batchcomplete":"","query":{"pages":{"7529378":{"pageid":7529378,"ns":0,"title":"Facebook","revisions":[{"revid":806369485,"parentid":805909999,"oresscores":{"damaging":{"true":0.039,"false":0.961},"goodfaith":{"true":0.978,"false":0.022}}}]}}}} $ curl -H "Accept: application/json" 'https://en.wikipedia.org/w/api.php?action=query&prop=revisions&titles=General%20Mills&rvprop=ids|oresscores&format=json' {"error":{"code":"internal_api_error_RuntimeException","info":"[<redacted>] Exception caught: No model available for [models]"},"servedby":"mw1230"}
In T162484: DRAFT: Use rate limiting for ORES Action API score retrieval and T163687: Re-enable ORES data in action API we talked about lazily fetching older revision IDs, which is one theory about the source of the error (see https://gerrit.wikimedia.org/r/#/c/350756/ for configuration support - I don't see that flag set on mediawiki-config, though). Another suggestion on IRC suggested that maybe "https://github.com/wikimedia/mediawiki-extensions-ORES/blob/master/includes/Hooks/ApiHooksHandler.php#L303 should be something like getScores(..)[wfWikiID()]['scores']".