When the most recent RHCOS boot image bump for 4.8 landed, only the stream metadata was changed. This was done since `openshift-installer` itself was updated to use only the stream metadata. https://github.com/openshift/installer/pull/5227 However, it appears that UPI jobs still rely on the "legacy" metadata: https://github.com/openshift/installer/blob/release-4.8/images/installer/Dockerfile.upi.ci#L17 While the drift in the different metadata sources shouldn't break the UPI jobs, it creates a different workflow as the IPI jobs will start from a different set of RHCOS artifacts than the UPI jobs.
@gpei noticed this discrepancy first - https://github.com/openshift/installer/pull/5227#issuecomment-930010185
This issue only affects 4.8 and will be used as the source for the necessary backport BZs. Closing as CURRENTRELEASE