It seems like jobs are not being enqueued in the job queue in beta. For example, the Special:GenerateInvitationList page uses the job queue, but it is currently not working (i.e., things remain in a "pending" state forever). Logstash showed no trace of clear errors, so I went on deployment-mwlog02 to see the logs, but there's no JobExecutor.log. The last one is from two days ago, but in the meantime things have definitely happen that should have enqueued jobs (for example, edits). Also, the jobqueue is empty:
daimona@deployment-deploy04:~$ mwscript showJobs.php --wiki enwiki DEPRECATION WARNING: Maintenance scripts are moving to Kubernetes. See https://wikitech.wikimedia.org/wiki/Maintenance_scripts for the new process. Maintenance hosts will be going away; please submit feedback promptly if maintenance scripts on Kubernetes don't work for you. (T341553) 0
So, it seems to me that we may not be enqueuing jobs.