When trying to scale up a MachineSets with multiple interfaces configured with static IPs it does not work.
When inspecting the VM afterburn the data is present, however is not associated to any interface and both address get assigned to one interface:
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govc vm.info -json /DC/vm/Folder/test-cluster1-mdcsn-worker-static-jf76h | grep -A 1 afterburn
            "key": "guestinfo.afterburn.initrd.network-kargs",
            "value": "ip=192.xxx.x.1:::255.xxx.xxx.0:::none nameserver=10.xx.xxx.1 ip=10.xx.xxx.233::10.xx.2xxx.254:255.xxx.xxx.0:::none nameserver=10.xx.xxx.1 "
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    1. Follow documentation [https://docs.openshift.com/container-platform/4.16/post_installation_configuration/node-tasks.html#nodes-vsphere-machine-set-scaling-static-ip_post-install-node-tasks]
    2. Use configure two interfaces

    Depending on the interface order the configuration get associated to the different interfaces, seems like both address get assigned to one interface:
[core@test-cluster1-mdcsn-worker-static-jf76h ~]$ ip -br a
lo               UNKNOWN        127.0.0.1/8 ::1/128
ens192           UP
ens224           UP             192.xxx.x.1/24 10.xx.xxx.233/23

    The IPs can land on the configured NIC/networkName and create successfully the node.