I'm seeing this log:
[error] [cb2c0697] /w/api.php ErrorException from line 420 of /vagrant/mediawiki/includes/jobqueue/JobQueueGroup.php: PHP Notice: JobQueueGroup::__destruct: 1 buffered job(s) of type(s) RecentChangesUpdateJob never inserted. #0 (): MWExceptionHandler::handleError() #1 /vagrant/mediawiki/includes/jobqueue/JobQueueGroup.php(420): trigger_error() #2 (): JobQueueGroup->__destruct() #3 {main}
which seems pretty bad. I don't know if its also in production but I searched and didn't see anyone filed an issue about it.