Resolution: Not A Defect
After taking the supplied zip of scm-api plugins, and applying it over top of a previously known good Jenkins 2.42 instance, the warning "You have data stored in an older format and/or unreadable data" appears.
Steps to reproduce:
- Set up Jenkins with a handful of Bitbucket and GitHub multibranch and organization jobs.
- Stop the Jenkins service entirely.
- Unzip the supplied scm-2.0.x-plugins.zip file on top of the /var/llib/jenkins/plugins directory
- Restart the Jenkins instance
- Sign on again
I will upload logs and everything else soon after getting this filed.