When specifying both PreProvisioningOSDownloadURLs and ProvisioningOSDownloadURL in the provisioning config CR, CBO will fail to reconcile becasuse two copies of machine-os-downloader init containers with the same name are started. The names of these initcontainers should be different when both of them are spawned together.
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 (Moderate: OpenShift Container Platform 4.9.0 bug fix and security 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/RHSA-2021:3759