The wait-for install-complete command deems a cluster has been successful installed by checking that all cluster operators are available. For a SNO or HighlyAvailable cluster, this is achieved when the operator's pod replica is 1 or 3.
    Because the same HighlyAvailable cluster topology is used with control plane replicas set to 4 or 5, it is possible for the wait-for install-complete command to report the cluster installation is successful when all control plane nodes have not joined or are not in ready status. This is because the cluster operators are available when it sees a replica count of 3. One would expect a cluster operator to be available when its pod replica count matches the control plane replica count (4 or 5).  

    4.18.0

    Always

    1. Install a 4 or 5 control plane replica cluster, but only bring up 4-1 or 5-1 nodes.
    2. Run wait-for install-complete
    3.
    

    Installation is reported to be successful with 3 (4 replicas desired) or 5 nodes (5 replicas desired).

    Installation is reported successful when the number of control plane nodes matches the replica count specified in the install-config.