Running scheduled jobs from wp-cli doesn't work
In looking into this a bit further I have failed to get the job to run via the wp-cli by specifing mail_report and instanceId=x, however, this answer works well with wp-cli civiCRM Cron only run one mail_report scheduled jobs?

By setting a scheduled job and setting the parameters, wp-cli triggrs the job just fine.

I am curious if drush exhibits the same behavior