the issue can be reproduced using master (with devstack)


$ openstack coe cluster template create k8s-cluster-template  --image fedora-coreos-35.20220116.3.0-openstack.x86_64 --keypair  testkey --external-network  public --flavor m1.small  --network-driver flannel  --coe kubernetes 
Request to create cluster template k8s-cluster-template accepted
+-----------------------+------------------------------------------------+
| Field                 | Value                                          |
+-----------------------+------------------------------------------------+
| insecure_registry     | -                                              |
| labels                | {}                                             |
| updated_at            | -                                              |
| floating_ip_enabled   | True                                           |
| fixed_subnet          | -                                              |
| master_flavor_id      | -                                              |
| uuid                  | 9c7edc11-a710-4f24-8850-f9911e7ff0d5           |
| no_proxy              | -                                              |
| https_proxy           | -                                              |
| tls_disabled          | False                                          |
| keypair_id            | testkey                                        |
| public                | False                                          |
| http_proxy            | -                                              |
| docker_volume_size    | -                                              |
| server_type           | vm                                             |
| external_network_id   | public                                         |
| cluster_distro        | fedora-coreos                                  |
| image_id              | fedora-coreos-35.20220116.3.0-openstack.x86_64 |
| volume_driver         | -                                              |
| registry_enabled      | False                                          |
| docker_storage_driver | overlay2                                       |
| apiserver_port        | -                                              |
| name                  | k8s-cluster-template                           |
| created_at            | 2023-10-03T19:45:21.945595+00:00               |
| network_driver        | flannel                                        |
| fixed_network         | -                                              |
| coe                   | kubernetes                                     |
| flavor_id             | m1.small                                       |
| master_lb_enabled     | False                                          |
| dns_nameserver        | 8.8.8.8                                        |
| hidden                | False                                          |
| tags                  | -                                              |
+-----------------------+------------------------------------------------+
$ openstack coe cluster create \           
    --cluster-template k8s-cluster-template \                                                                                                                                                                                                                                        
    --timeout 120 \                                                                                                                                                                                                                                                                  
    --fixed-network private \                                                                                                                                                                                                                                                        
    k8scluster                                                       
Request to create cluster fb6f509d-f0d0-4e1d-89be-bb01a02b67f0 accepted       
$ openstack coe cluster list
+--------------------------------------+------------+---------+------------+--------------+---------------+---------------+
| uuid                                 | name       | keypair | node_count | master_count | status        | health_status |
+--------------------------------------+------------+---------+------------+--------------+---------------+---------------+
| fb6f509d-f0d0-4e1d-89be-bb01a02b67f0 | k8scluster | testkey |          1 |            1 | CREATE_FAILED | None          |
+--------------------------------------+------------+---------+------------+--------------+---------------+---------------+
$ openstack coe cluster show k8scluster                                                                                                                                                                                                            [34/232]
+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field                | Value                                       
                                                                                                                                                                                                                   |
+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| status               | CREATE_FAILED                               
                                                                                                                                                                                                                   |
| health_status        | None                                        
                                                                                                                                                                                                                   |
| cluster_template_id  | 9c7edc11-a710-4f24-8850-f9911e7ff0d5        
                                                                                                                                                                                                                   |
| node_addresses       | []                                          
                                                                                                                                                                                                                   |
| uuid                 | fb6f509d-f0d0-4e1d-89be-bb01a02b67f0        
                                                                                                                                                                                                                   |
| stack_id             | dc437fdc-fda5-4954-8911-b198891d08b0        
                                                                                                                                                                                                                   |
| status_reason        | default-master failed, default-worker failed
                                                                                                                                                                                                                   |
| created_at           | 2023-10-03T19:46:13+00:00                   
                                                                                                                                                                                                                   |
| updated_at           | 2023-10-03T19:46:27+00:00                   
                                                                                                                                                                                                                   |
| coe_version          | v1.18.16                                    
                                                                                                                                                                                                                   |
| labels               | {}                                          
                                                                                                                                                                                                                   |
| labels_overridden    | {}                                          
                                                                                                                                                                                                                   |
| labels_skipped       | {}                                          
                                                                                                                                                                                                                   |
| labels_added         | {}                                          
                                                                                                                                                                                                                   |
| fixed_network        | private                                     
                                                                                                                                                                                                                   |
| fixed_subnet         | None                                        
                                                                                                                                                                                                                   |
| floating_ip_enabled  | True                                        
                                                                                                                                                                                                                   |
| faults               | {'default-master': "Resource CREATE failed: resources[0]: resources.kube_masters.Property error: resources.kube_master_eth0.properties.fixed_ips[0].subnet: Multiple subnet matches found for name '', use an ID to be more specific.", 'default-worker': "R
esource CREATE failed: resources[0]: resources.kube_masters.Property error: resources.kube_master_eth0.properties.fixed_ips[0].subnet: Multiple subnet matches found for name '', use an ID to be more specific."} |
| keypair              | testkey                                     
                                                                                                                                                                                                                   |
| api_address          | None                                        
                                                                                                                                                                                                                   |
| master_addresses     | []                                          
                                                                                                                                                                                                                   |
| master_lb_enabled    | False                                       
                                                                                                                                                                                                                   |
| create_timeout       | 120                                         
                                                                                                                                                                                                                   |
| node_count           | 1                                           
                                                                                                                                                                                                                   |
| discovery_url        | https://discovery.etcd.io/5995d219f185569291e37cc2b2b49757                                                       
                                                                                                                                                                                                                   |
| docker_volume_size   | None                                        
                                                                                                                                                                                                                   |
| master_count         | 1                                           
                                                                                                                                                                                                                   |
| container_version    | 1.12.6                                      
                                                                                                                                                                                                                   |
| name                 | k8scluster                                  
                                                                                                                                                                                                                   |
| master_flavor_id     | None                                        
                                                                                                                                                                                                                   |
| flavor_id            | m1.small                                    
                                                                                                                                                                                                                   |
| health_status_reason | {}                                          
                                                                                                                                                                                                                   |
| project_id           | 8bb2b3ffd1854807be8d79a7a407b134            
                                                                                                                                                                                                                   |
+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+