GIT Parameter latest version plugin is not showing the revision numbers in dropdown list
Maybe You have a big repository. When repository is a big plugin need more time to get and show revisions, especially when workspace is empty.
Do you have set 'Branch' option in git-parameter configuration?
Just few more information:
Could you add jenkins.log and console log from web browser? (or some screenshot)
Is this issue still up to date?
If yes, please add jenkins.log and console log from web browser? (or some screenshot)