git.branch in maven under jenkins pipelines is wrong evaluated to the commit #325

I have maven pom.xml, where I use git.branch and git.commit.id.abbrev to create database schema for my tests.

This works fine, when I call maven in my development environment.

But when maven is called from a jenkins pipeline on the same branch, then git.branch is replaced with the full commit id.

This seems to be related to the detached mode of jenkins pipeline working copies of the workspace: