False positive when adding optional property

Commencez avec les fixtures fournis test/old.json et test/new.json et reproduisez le résultat à l’aide de la commande Docker indiquée dans le rapport. Suivez la vérification de compatibilité du schéma du corps de la requête pour une propriété ajoutée sans champ obligatoire, puis ajoutez un test de régression et confirmez que la comparaison ne signale plus de changement rétro-incompatible.

When comparing these 2 schemas:

test/old.json

{
  "openapi": "3.0.0",
  "servers": [{ "url": "https://myserver.com" }],
  "info": { "title": "My API", "description": "Description", "version": "0.2.0" },
  "paths": {
    "/v1/entity/{id}": {
      "put": {
        "operationId": "myOperation",
        "description": "Some description",
        "requestBody": { "$ref": "#/components/requestBodies/updateBody" }
      }
    }
  },
  "components": {
    "schemas": {},
    "responses": {},
    "requestBodies": {
      "updateBody": {
        "description": "Update description",
        "content": {
          "application/json": {
            "schema": {
              "type": "object",
              "properties": {
                "url": { "type": "string", "description": "Some URL" }
              },
              "title": "updateBody",
              "additionalProperties": false
            }
          }
        }
      }
    },
    "parameters": {}
  }
}

test/new.json

{
  "openapi": "3.0.0",
  "servers": [{ "url": "https://myserver.com" }],
  "info": { "title": "My API", "description": "Description", "version": "0.2.0" },
  "paths": {
    "/v1/entity/{id}": {
      "put": {
        "operationId": "myOperation",
        "description": "Some description",
        "requestBody": { "$ref": "#/components/requestBodies/updateBody" }
      }
    }
  },
  "components": {
    "schemas": {},
    "responses": {},
    "requestBodies": {
      "updateBody": {
        "description": "Update description",
        "content": {
          "application/json": {
            "schema": {
              "type": "object",
              "properties": {
                "url": { "type": "string", "description": "Some URL" },
                "url2": { "type": "string", "description": "Some URL" }
              },
              "title": "updateBody",
              "additionalProperties": false
            }
          }
        }
      }
    },
    "parameters": {}
  }
}

I get a broken compatibility message:

docker run --rm -t -v $(pwd)/test/:/specs:ro openapitools/openapi-diff:latest --fail-on-incompatible  /specs/old.json /specs/new.json 
==========================================================================
==                            API CHANGE LOG                            ==
==========================================================================
                                  My API                                  
--------------------------------------------------------------------------
--                            What's Changed                            --
--------------------------------------------------------------------------
- PUT    /v1/entity/{id}
  Request:
        - Changed application/json
          Schema: Broken compatibility
--------------------------------------------------------------------------
--                                Result                                --
--------------------------------------------------------------------------
                 API changes broke backward compatibility                 
--------------------------------------------------------------------------

Note that the only change is the addition of the url2 optional property:

diff -u test/old.json test/new.json
--- test/old.json       2023-03-14 17:06:02
+++ test/new.json       2023-03-14 17:06:33
@@ -22,7 +22,8 @@
             "schema": {
               "type": "object",
               "properties": {
-                "url": { "type": "string", "description": "Some URL" }
+                "url": { "type": "string", "description": "Some URL" },
+                "url2": { "type": "string", "description": "Some URL" }
               },
               "title": "updateBody",
               "additionalProperties": false

Since the required field is absent, I would expect the addition of url2 to not create a broken compatibility error.