DICOMIoIntegrationTest failing: 409 Conflict for url

Python postcommit is failing test apache_beam.io.gcp.dicomio_integration_test.DICOMIoIntegrationTest.test_dicom_search_instances.

requests.exceptions.HTTPError: 409 Client Error: Conflict for url:

https://healthcare.googleapis.com/v1/projects/apache-beam-testing/locations/us-central1/datasets/apache-beam-integration-testing/dicomStores?dicomStoreId=DICOM_store_WRmhFzqnPc8ZnNj

This same URL was logged by two consecutive runs, which is suspicious because the string at the end is supposed to be random.

https://ci-beam.apache.org/job/beam_PostCommit_Python38/1622/testReport/junit/apache_beam.io.gcp.dicomio_integration_test/DICOMIoIntegrationTest/test_dicom_search_instances/