Aggregation of allOf combined with additionalProperties false not working - Response validation

I am getting the following error when validating response for a /route endpoint (see schema and the response example below)

Error: .response should NOT have additional properties, .response should NOT have additional properties
    at ResponseValidator._validate (C:\Code\automation\node_modules\express-openapi-validator\dist\middlewares\openapi.response.validator.js:83:32)
    at C:\Code\automation\node_modules\express-openapi-validator\dist\middlewares\openapi.response.validator.js:27:29
    at ServerResponse.json_hook (C:\Code\automation\node_modules\express-openapi-validator\dist\framework\modded.express.mung.js:35:24)
    at ServerResponse.send (C:\Code\automation\node_modules\express\lib\response.js:158:21)
    at c:\Code\automation\src\dataserver\Server.ts:268:25
    at Layer.handle [as handle_request] (C:\Code\automation\node_modules\express\lib\router\layer.js:95:5)
    at next (C:\Code\automation\node_modules\express\lib\router\route.js:137:13)
    at Route.dispatch (C:\Code\automation\node_modules\express\lib\router\route.js:112:3)

Expected result: The validation should pass

Example 1 - Demonstrates the issue

Having the following schema, the below response causes validation error - no additional properties Schema:

---
  openapi: "3.0.0"
  info:
    title: "Test for allOf"
    version: "1"
  paths:
    /route:
      get:
        responses:
          200:
            description: ""
            content:
              application/json:
                schema:
                  $ref: "#/components/schemas/RouteType"
  components:
    schemas:
      RouteType:
        allOf:
          -
            $ref: "#/components/schemas/Type1"
          -
            $ref: "#/components/schemas/Type2"
      Type1:
        type: "object"
        additionalProperties: false
        properties:
          property1:
            type: "integer"
      Type2:
        type: "object"
        additionalProperties: false
        properties:
          property2:
            type: "string"

Response:

---
  property1: 1
  property2: SomeString

Example 2 - No issue

If there is just one item in allOf collection, it validates correctly:

Schema:

---
  openapi: "3.0.0"
  info:
    title: "Test for allOf"
    version: "1"
  paths:
    /route:
      get:
        responses:
          200:
            description: ""
            content:
              application/json:
                schema:
                  $ref: "#/components/schemas/RouteType"
  components:
    schemas:
      RouteType:
        allOf:
          -
            $ref: "#/components/schemas/Type1"
      Type1:
        type: "object"
        additionalProperties: false
        properties:
          property1:
            type: "integer"

Response:

---
  property1: 1

[asafMasa]

@cdimascio is there any progress with this issue?

[cdimascio]

FYI, i saw this today, json-schema-merge-all-of. I will plan to look into it. Im curious if it might help this situation. If so, perhaps, we can leverage it within the validator.

It seems to tackle this issue as well

Option to override common impossibility like adding properties when using additionalProperties: false