(As always, I have no idea what component to select. Why do you ask an lay person like me to pick a component? Only a Jenkins developer knows what components there are and how to assign to one.)

The issue I'm having is the same (or very similar) to JENKINS-42971 and JENKINS-28447. Both are marked resolved. But happens for me and I'm using latest version of Jenkins.

As described in 42971 I have param named GIT_BRANCH and for the git repo setup I have the branch set to ${GIT_BRANCH}. Without lightweight checkout, this works as I want; the branch specified by the parameter value is checked out. But, with lightweight checkout selected, it tries to checkout branch "${GIT_BRANCH}" which is not what I want nor does it exist.