Note that even though review.opendev.org/800304 merged I still get:

2021-08-16 14:13:03.823567 | 5254001b-0a8c-78a9-679c-00000000001e |       TASK | Delete heat stack
2021-08-16 14:13:05.393458 | 5254001b-0a8c-78a9-679c-00000000001e |      RETRY | Delete heat stack | localhost | 3 retries left
2021-08-16 14:13:11.898565 | 5254001b-0a8c-78a9-679c-00000000001e |      RETRY | Delete heat stack | localhost | 2 retries left
2021-08-16 14:13:18.314078 | 5254001b-0a8c-78a9-679c-00000000001e |      RETRY | Delete heat stack | localhost | 1 retries left
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: keystoneauth1.exceptions.catalog.EndpointNotFound: public endpoint for orchestration service in regionOne region not found
2021-08-16 14:13:24.769580 | 5254001b-0a8c-78a9-679c-00000000001e |      FATAL | Delete heat stack | localhost | error={"attempts": 3, "changed": false, "module_stderr": "Traceback (most recent call last):\n  File \"<stdin>\", line 102, in <module>\n  File \"<stdin>\", line 94, in _ansiballz_main\n  File \"<stdin>\", line 40, in invoke_module\n  File \"/usr/lib64/python3.6/runpy.py\", line 205, in run_module\n    return _run_module_code(code, init_globals, run_name, mod_spec)\n  File \"/usr/lib64/python3.6/runpy.py\", line 96, in _run_module_code\n    mod_name, mod_spec, pkg_name, script_name)\n  File \"/usr/lib64/python3.6/runpy.py\", line 85, in _run_code\n    exec(code, run_globals)\n  File \"/tmp/ansible_openstack.cloud.stack_payload_2dvf1js4/ansible_openstack.cloud.stack_payload.zip/ansible_collections/openstack/cloud/plugins/modules/stack.py\", line 248, in <module>\n  File \"/tmp/ansible_openstack.cloud.stack_payload_2dvf1js4/ansible_openstack.cloud.stack_payload.zip/ansible_collections/openstack/cloud/plugins/modules/stack.py\", line 244, in main\n  File \"/tmp/ansible_openstack.cloud.stack_payload_2dvf1js4/ansible_openstack.cloud.stack_payload.zip/ansible_collections/openstack/cloud/plugins/module_utils/openstack.py\", line 406, in __call__\n  File \"/tmp/ansible_openstack.cloud.stack_payload_2dvf1js4/ansible_openstack.cloud.stack_payload.zip/ansible_collections/openstack/cloud/plugins/modules/stack.py\", line 218, in run\n  File \"/usr/lib/python3.6/site-packages/openstack/cloud/_orchestration.py\", line 255, in get_stack\n    self, _search_one_stack, name_or_id, filters)\n  File \"/usr/lib/python3.6/site-packages/openstack/cloud/_utils.py\", line 198, in _get_entity\n    entities = search(name_or_id, filters, **kwargs)\n  File \"/usr/lib/python3.6/site-packages/openstack/cloud/_orchestration.py\", line 243, in _search_one_stack\n    stack = self.orchestration.find_stack(\n  File \"/usr/lib/python3.6/site-packages/openstack/service_description.py\", line 87, in __get__\n    proxy = self._make_proxy(instance)\n  File \"/usr/lib/python3.6/site-packages/openstack/service_description.py\", line 262, in _make_proxy\n    found_version = temp_adapter.get_api_major_version()\n  File \"/usr/lib/python3.6/site-packages/keystoneauth1/adapter.py\", line 354, in get_api_major_version\n    return self.session.get_api_major_version(auth or self.auth, **kwargs)\n  File \"/usr/lib/python3.6/site-packages/keystoneauth1/session.py\", line 1276, in get_api_major_version\n    return auth.get_api_major_version(self, **kwargs)\n  File \"/usr/lib/python3.6/site-packages/keystoneauth1/identity/base.py\", line 500, in get_api_major_version\n    data = get_endpoint_data(discover_versions=discover_versions)\n  File \"/usr/lib/python3.6/site-packages/keystoneauth1/identity/base.py\", line 279, in get_endpoint_data\n    service_name=service_name)\n  File \"/usr/lib/python3.6/site-packages/keystoneauth1/access/service_catalog.py\", line 462, in endpoint_data_for\n    raise exceptions.EndpointNotFound(msg)\nkeystoneauth1.exceptions.catalog.EndpointNotFound: public endpoint for orchestration service in regionOne region not found\n", "module_stdout": "", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}
2021-08-16 14:13:24.770286 | 5254001b-0a8c-78a9-679c-00000000001e |     TIMING | Delete heat stack | localhost | 0:00:29.326839 | 20.95s
2021-08-16 14:13:24.775090 | 5254001b-0a8c-78a9-679c-00000000001f |       TASK | Notice
2021-08-16 14:13:24.812043 | 5254001b-0a8c-78a9-679c-00000000001f |         OK | Notice | localhost | result={
    "changed": false,
    "msg": "The Heat stack for \"overcloud\" was not deleted, depending on the deployment type this may be normal."
}
2021-08-16 14:13:24.813250 | 5254001b-0a8c-78a9-679c-00000000001f |     TIMING | Notice | localhost | 0:00:29.369808 | 0.04s

I get that afterwards we print "this might be okay", but this is a bit hostile for the user. Can't we hide that scary error message when we detect ephemeral heat at play?