When use the oc-mirror 4.16 to do mirror2mirror for `apiVersion: mirror.openshift.io/v1alpha2` imagesetconfig, the command failed with error: 
    info: Mirroring completed in 200ms (0B/s)
    error: error rebuilding catalog images from file-based catalogs: error copying image docker://registry.redhat.io/redhat/community-operator-index:v4.14 to docker://my-route-e2e-test-ocmirror-g6wsw.apps.yinzhou-0513.qe.devcluster.openshift.com/redhat/community-operator-index:v4.14: copying system image from manifest list: Source image rejected: Invalid GPG signature: gpgme.Signature{Summary:128, Fingerprint:"1AC4971355A34A82", Status:gpgme.Error{err:0x9}, Timestamp:time.Date(2024, time.May, 10, 18, 20, 1, 0, time.Local), ExpTimestamp:time.Date(1970, time.January, 1, 0, 0, 0, 0, time.Local), WrongKeyUsage:false, PKATrust:0x0, ChainModel:false, Validity:0, ValidityReason:error(nil), PubkeyAlgo:1, HashAlgo:8}

./oc-mirror version --output=yaml
clientVersion:
  buildDate: "2024-05-08T04:26:09Z"
  compiler: gc
  gitCommit: 9e77c1944f70fed0a85e5051c8f3efdfb09add70
  gitTreeState: clean
  gitVersion: 4.16.0-202405080039.p0.g9e77c19.assembly.stream.el9-9e77c19
  goVersion: go1.21.9 (Red Hat 1.21.9-1.el9_4) X:strictfipsruntime
  major: ""
  minor: ""
  platform: linux/amd64

always

1) Use following isc to do mirror2mirror for v2: cat config-66870.yaml 
kind: ImageSetConfiguration
apiVersion: mirror.openshift.io/v1alpha2
mirror:
  operators:
  - catalog: registry.redhat.io/redhat/community-operator-index:v4.14
    packages:
    - name: external-secrets-operator

 `oc-mirror -c isc_31536.yaml docker://localhost:5000/31536 --dest-use-http --dest-skip-tls`

1) catalogs/registry.redhat.io/redhat/certified-operator-index/v4.15/layout/index.json
catalogs/registry.redhat.io/redhat/certified-operator-index/v4.15/layout/oci-layout
    info: Mirroring completed in 200ms (0B/s)
    error: error rebuilding catalog images from file-based catalogs: error copying image docker://registry.redhat.io/redhat/community-operator-index:v4.14 to docker://my-route-e2e-test-ocmirror-g6wsw.apps.yinzhou-0513.qe.devcluster.openshift.com/redhat/community-operator-index:v4.14: copying system image from manifest list: Source image rejected: Invalid GPG signature: gpgme.Signature{Summary:128, Fingerprint:"1AC4971355A34A82", Status:gpgme.Error{err:0x9}, Timestamp:time.Date(2024, time.May, 10, 18, 20, 1, 0, time.Local), ExpTimestamp:time.Date(1970, time.January, 1, 0, 0, 0, 0, time.Local), WrongKeyUsage:false, PKATrust:0x0, ChainModel:false, Validity:0, ValidityReason:error(nil), PubkeyAlgo:1, HashAlgo:8}

1) no error

compared with oc-mirror 4.15 , can't reproduce the same issue.