use fabric8 kubernetes java lient delete resource with delete option not work

Question

    Boolean delete = apiClient.apps().statefulSets().inNamespace(namespace).withName(name)
            .withPropagationPolicy(DeletionPropagation.ORPHAN)
            .delete();
    if (delete != null && delete) {
        log.info("Delete sts {}/{}", namespace, name);
    }

Although I have set propagationpolicy to orphan, the dependency pod was deleted after statefulset deletion which expect pod not to be deleted. Append: Api version I used is 5.10.1 kubernetes version is 1.19