This may also manifest itself in seeing the message "No changesets executed" on previously executed rollback jobs. Which is technically correct, but a message that was not shown in previous versions.
Mainly a cosmetic issue.
The problem was introduced when ExecutedChangesetAction#rollbackOnly was renamed but not accounted. (see https://wiki.jenkins-ci.org/display/JENKINS/Hint+on+retaining+backward+compatibility ).
Resolution will involve providing migration in a readResolve method.