Parallel blocks in node blocks cause executors to be persisted outside of the node block

@Test public void shouldNotLeakExecutorsViaContextVars() {
    story.then(r -> {
        DumbSlave s = r.createOnlineSlave();
        WorkflowJob p = r.jenkins.createProject(WorkflowJob.class, "demo");
        p.setDefinition(new CpsFlowDefinition("node('" + s.getNodeName() + "') {\n" +
                "  parallel one: {\n" +
                "    echo '" + s.getNodeName() + "'\n" +
                "  }\n" +
                "}\n" +
                "semaphore 'wait'\n", false));
        WorkflowRun b = p.scheduleBuild2(0).waitForStart();
        SemaphoreStep.waitForStart("wait/1", b);
        r.jenkins.removeNode(s);
    });
    story.then(r -> {
        WorkflowRun b = r.jenkins.getItemByFullName("demo", WorkflowJob.class).getBuildByNumber(1);
        SemaphoreStep.waitForStart("wait/1", b);
        SemaphoreStep.success("wait/1", null);
        while (b.isBuilding()) {
            r.assertLogNotContains("Jenkins doesn’t have label", b);
            Thread.sleep(100);
        }
        r.assertBuildStatusSuccess(b);
    });
}