• create 2 freestyle jobs test-parallel-job-1 and test-parallel-job-2 with just a 'execute shell script' build step that does 'echo $JOB_NAME'

• create a workflow job with the following groove script:

def packageBuilds = [:]
packageBuilds["linux"] = {
build 'test-paralell-job-1'
}
packageBuilds["windows"] = {
build 'test-paralell-job-2'
}

parallel packageBuilds

• launch a build of the workflow job, it never finishes and doesn't build test-parallel-job-1 and test-parallel-job-2, no error in the console output.