Responses Missing from OpenAPI Specification

The POST response bodies are not included in the OAS exposed by PocketIC's /api.json endpoint.

Example:

{
  ...
  "/instances/": {
    "get": {
      "responses": {
        "200": {
          "description": "",
          "content": {
            "application/json": {
              "schema": {
                "type": "array",
                "items": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    },
    "post": {
      "requestBody": {
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/ExtendedSubnetConfigSet"
            }
          }
        },
        "required": true
      }
    }
  },
  ...
}

Start at PocketIC's /api.json endpoint and inspect the generated OpenAPI entry for POST /instances/. Compare it with the included GET response example, then verify that the POST operation exposes its response body and schema in the generated specification.