4.9 has already shipped, so aim for 4.9.z. And not a regression since 4.9.0 (the current behavior is old code), so blocker-.
oc get clusterversion NAME VERSION AVAILABLE PROGRESSING SINCE STATUS version 4.9.0-0.nightly-2021-10-25-231142 True False 11m Cluster version is 4.9.0-0.nightly-2021-10-25-231142 oc get clusteroperators | grep kube-storage kube-storage-version-migrator 4.9.0-0.nightly-2021-10-25-231142 True False False 37m oc describe co/kube-storage-version-migrator | grep -B 3 Upgradeable Message: All is well Reason: AsExpected Status: True Type: Upgradeable
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 (OpenShift Container Platform 4.9.5 bug fix update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:4005