on beta, and will reach production unless fixed.
Feb 3 16:32:43 deployment-jobrunner01: #012Warning: in_array() expects parameter 2 to be an array or collection in /srv/mediawiki/wmf-config/Wikibase.php on line 120
Feb 3 16:32:44 deployment-jobrunner01: #012Notice: Undefined variable: wgMFQueryPropModules in /srv/mediawiki/wmf-config/Wikibase.php on line 120
Problem is that MobileFrontend now defines $wgMFQueryPropModules in extension.json, so the variable is no longer available at that point in configuration.