CMPS was supported in 4.15 on vsphere platform when enable TechPreviewNoUpgrade. but after I build the cluster with no failure domains/single failure domain setting in install-config. there were three duplicated failure domains.

    4.15.0-0.nightly-2023-12-11-033133

    install a cluster with TP enabled and don't set failure domain (or set single failure doamin) in install-config.

    1. do not config failure domain in install-config (or set single failure doamin).
    2. install a cluster with TP enabled
    3. check CPMS with command:   
       oc get controlplanemachineset -oyaml    

duplicated failure domains.
        failureDomains:
     platform: VSphere
     vsphere:
     - name: generated-failure-domain
     - name: generated-failure-domain
     - name: generated-failure-domain
    metadata:
     labels:

 failure domain should not duplicated when setting single failure domain in install-config.
 failure domain should not exists when not setting failure domain in install-config.