I've been testing on https://meta.wikimedia.beta.wmflabs.org/wiki/Special:RecentChanges this feature.
- Granted MarcoAurelio (test) temporary adminship for 10 minutes.
- account appears flagged at Special:ListUsers with a temporary warning and log format is correct
- After the expiration, the account is removed from Special:Listusers/sysops as expected, however Special:UserRights still displays the checkbox checked.
When the right expire, the checkboxes at special:userrights should be updated accordingly. Thanks.