Image registry is using outdated name for kube-controller-manager command. In https://github.com/openshift/release/blob/dfd2beadbd400ce3ac680b2e3a430f58bcc5e63d/ci-operator/templates/master-sidecar-4.2.yaml#L1322 it is invoking hyperkube controller-manager but should hyperkube kube-controller- manager.
This issue has been fixed in 4.3 repo
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. https://access.redhat.com/errata/RHBA-2020:0062