oc-mirror fails with "Instructed to preserve digests" when mirroring images for RHOCP 4

Solution Verified - Updated -

Issue

  • oc-mirror fails to mirror an image to a private registry and fails with:

    Manifest list must be converted to type "application/vnd.docker.distribution.manifest.list.v2+json" to be written to destination, but we cannot modify it: "Instructed to preserve digests

Environment

  • Red Hat OpenShift Container Platform 4

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