This will be fixed when we cherry-pick https://github.com/ovn-org/ovn-kubernetes/pull/1044 to openshift/ovn-kubernetes.
Yes, I meant "this exact error will be fixed when we cherry-pick that". I didn't mean "IPv6 will be fixed". I'm going to close this bug, since IPv6 is still not expected to work for QE. I will be sending mail with details when it is possible for QE to test.
IPv6 on Azure is not expected to work yet and that we would not expect a rapid fix or any sort of release blocker for IPv6 on Azure bugs.
IPv6 on Azure is not supported at all in 4.4 or 4.5.