I am attempting to trigger a Jenkins Pipeline build by pushing a new tag, without making a new commit. We have a Jenkinsfile on the master branch. My attempts so far are documented here:

https://stackoverflow.com/questions/50778526/trigger-a-jenkins-pipeline-by-tagging-an-existing-commit

There is an old issue (which was closed and I reopened) that matches my problem exactly. It should be fixed, but it appears to have regressed. Since the reopened issue is not receiving any attention, I created a new issue.

https://issues.jenkins-ci.org/browse/JENKINS-14917