In 4.4 we added code to pass "--node-ip ::" to kubelet on single-stack IPv6 non-bare-metal to tell it to advertise an IPv6 node address rather than an IPv4 one. This accidentally never got backported. (This doesn't affect bare-metal, where we pass an explicit --node-ip to ensure that it doesn't pick the wrong IPv6 address.)
Closing as per https://github.com/openshift/machine-config-operator/pull/1538#issuecomment-609054691