If I define a pipeline job with environment variables in it, on the second (and subsequent) runs, the environment disappears.

def my_job = pipelineJob("/${ROOT}/${BRANCH_FOLDER}/${pf}/${test}")
my_job.with {
  description "${test} on ${pf} (${BRANCH_FOLDER})".replaceAll('_', ' ')
  displayName test.replaceAll('_', ' ')
  definition {
      cps {
          script(readFileFromWorkspace('jenkins/runtime/groovy/Jenkinsfile_example_job_to_run.groovy'))
          sandbox()
      }
  }
  environmentVariables {
    envs(
      Upstream_Job_Name: JOB_NAME,
      Upstream_Job_Build: BUILD_NUMBER,
      GIT_BRANCH: BRANCH_FOLDER,
      PLATFORM: pf,
      COMPONENT_TO_TEST: test,
      )
      keepBuildVariables(true)
  }
  quietPeriod 1 // 1 second
} // my_job

// Launch it!
queue(my_job) // should be able to be a string too

1. Delete the job
2. Run the job
3. Save off target job's config.xml on server
4. Run the seed job again
5. Compare on the server:

   $ diff -u ./jobs/Test_Results/jobs/branchname/jobs/pform/jobs/mytest/config.xml /tmp/mytest_good.xml
   --- ./jobs/Test_Results/jobs/branchname/jobs/pform/jobs/mytest/config.xml        2018-04-27 14:52:08.569820997 -0400
   +++ /tmp/mytest_good.xml        2018-04-27 14:51:46.503906858 -0400
   @@ -5,6 +5,21 @@
      <displayName>mytest</displayName>
      <keepDependencies>false</keepDependencies>
      <properties>
   +    <EnvInjectJobProperty plugin="envinject@2.1.5">
   +      <info>
   +        <propertiesContent>Upstream_Job_Name=seed_job
   +Upstream_Job_Build=156
   +GIT_BRANCH=branchname
   +HDL_PLATFORM=pform
   +COMPONENT_TO_TEST=mytest</propertiesContent>
   +        <loadFilesFromMaster>false</loadFilesFromMaster>
   +      </info>
   +      <on>true</on>
   +      <keepJenkinsSystemVariables>true</keepJenkinsSystemVariables>
   +      <keepBuildVariables>true</keepBuildVariables>
   +      <overrideBuildParameters>false</overrideBuildParameters>
   +      <contributors/>
   +    </EnvInjectJobProperty>
        <jenkins.model.BuildDiscarderProperty>
          <strategy class="hudson.tasks.LogRotator">
            <daysToKeep>-1</daysToKeep>