Verified with OCP 4.4.0-0.nightly-2020-03-12-233620,
$ oc get kubeapiserver/cluster -o json | jq .spec.observedConfig.storageConfig
There should not has the ipv6 endpoint "https://[::1]:2379".
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.