the fix was included in the latest rebase (upstream 1.18)
Verified with OCP 4.5.0-0.nightly-2020-04-26-225842 as https://bugzilla.redhat.com/show_bug.cgi?id=1820509#c2, $ oc logs packageserver-59d6b6fcfd-lmhmk -n openshift-operator-lifecycle-manager | grep 'configmap "extension-apiserver-authentication" not found' Nothing found.
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 4.5 image release 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-2020:2409