I've got a patch going in upstream and will pull it in ASAP. In the meantime do note that it will dump plain-text disallowed_leaders in stretch mode.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Moderate: Red Hat Ceph Storage 5.1 Security, Enhancement, and Bug Fix update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2022:1174