External Documentation is not rendered if it's inside root of the schema

External Documentation is not rendered if it's inside root of the schema. However there are no problems if external docs are located inside any property of an object.

Schema minimal example:

{
  "components": {
    "schemas": {
      "AuthorizationHeaderMissingApiProblem": {
        "externalDocs": {
          "description": "RFC 7807 (Problem Details for HTTP APIs)",
          "url": "https://tools.ietf.org/html/rfc7807"
        },
        "nullable": false,
        "properties": { ... },
        "type": "object",
        "title": "AuthorizationHeaderMissingApiProblem"
      }
    }
  }
}

This schema used in responses and it's missing rendered external docs section (probably it will be missed in requests too).

Start by reproducing the issue with the minimal OpenAPI schema in the report, using the schema in a response and checking the rendered output. Trace how root-level externalDocs are handled compared with externalDocs inside an object property; done means the external documentation section renders for both responses and requests.