[OCP-Release 4.12] rhel-coreos-8, rhel-coreos-8-extensions : Missing source code repositories

[spica5]

From the OCP 4.12 release image, I pulled the information for all internal images into the JSON.
In that JSON file, 3 operators (rhel-coreos-8, rhel-coreos-8-extensions, machine-os-content) have no source code references while all other 180 operators have.

  ...
  {
    "annotations": {
      "io.openshift.build.commit.id": "",
      "io.openshift.build.commit.ref": "",
      "io.openshift.build.source-location": ""
    },
    "from": {
      "kind": "DockerImage",
      "name": "quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:822bc2bc6d2bd15262e53c2745d17fd1416633891d69fd8d0df9847bd072da40"
    },
    "generation": null,
    "importPolicy": {},
    "name": "rhel-coreos-8",
    "referencePolicy": {
      "type": ""
    }
  },
  {
    "annotations": {
      "io.openshift.build.commit.id": "",
      "io.openshift.build.commit.ref": "",
      "io.openshift.build.source-location": ""
    },
    "from": {
      "kind": "DockerImage",
      "name": "quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:ebfc5c69cc49f5f1547eecba53ac5bcb9817efc51ecf7e2c608977ea36ff88ae"
    },
    "generation": null,
    "importPolicy": {},
    "name": "rhel-coreos-8-extensions",
    "referencePolicy": {
      "type": ""
    }
  },
  {
    "annotations": {
      "io.openshift.build.commit.id": "0f141ce9d349fb30755e3d0d7f9f196a91782957",
      "io.openshift.build.commit.ref": "",
      "io.openshift.build.source-location": "https://github.com/openshift/route-controller-manager"
    },
    "from": {
      "kind": "DockerImage",
      "name": "quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:2efa8b2051bb7c1573142b24386927f26d77572acdc1bba969588c34aec6b7db"
    },
    "generation": null,
    "importPolicy": {},
    "name": "route-controller-manager",
    "referencePolicy": {
      "type": ""
    }
  },
  ...

Where are the source codes for those operators?

Attached the full JSON file.

ocp-release_4.12.30-x86_64_operators.json

[spica5]

openshift-release-dev_ocp-release_4.12.30-x86_64.json