Promotions aren't copies when job generated with DSL

freeStyleJob('test1') {
  properties {
    promotions {
      promotion {
        name('promotion 1')
        icon('Silver white star')
        conditions {
          manual('admin')
        }
        actions {
          shell "echo test"
        }
      }
    }
  }
}

freeStyleJob('test2') {
  using('test1')
}

<?xml version="1.0" encoding="UTF-8"?><project>
    <actions/>
    <description/>
    <keepDependencies>false</keepDependencies>
    <properties>
        <hudson.plugins.promoted__builds.JobPropertyImpl plugin="promoted-builds@2.28">
            <activeProcessNames>
                <string>promotion 1</string>
            </activeProcessNames>
        </hudson.plugins.promoted__builds.JobPropertyImpl>
    </properties>
    <scm class="hudson.scm.NullSCM"/>
    <canRoam>true</canRoam>
    <disabled>false</disabled>
    <blockBuildWhenDownstreamBuilding>false</blockBuildWhenDownstreamBuilding>
    <blockBuildWhenUpstreamBuilding>false</blockBuildWhenUpstreamBuilding>
    <triggers/>
    <concurrentBuild>false</concurrentBuild>
    <builders/>
    <publishers/>
    <buildWrappers/>
</project>

# ls test2/promotions/ | wc -l
0