improper validation of x-www-form-urlencoded with arbitrary nested allOf

[mikhailovavexmocom]

in case of json, there're ways to describe and validate complex structures;
with form-data the same can be achieved - however, currently there's need of properties duplication;
give kin dry spec - it fails

example:

openapi: 3.0.3
info:
  version: 1.0.0
  title: sample api
  description: api service paths to test the issue
paths:
  /api/path:
    post:
      summary: path
      tags:
        - api
      requestBody:
        required: true
        content:
          application/json:
            schema: { $ref: '#/components/schemas/PathRequest' }
          application/x-www-form-urlencoded:
            schema: { $ref: '#/components/schemas/PathRequest' }
      responses:
        '200':
          description: Ok
          content:
            application/json:
              schema: { $ref: '#/components/schemas/PathResponse' }
components:
  schemas:
    Msg_Opt:
      properties:
        msg: { type: string }
    Msg:
      allOf:
        - $ref: '#/components/schemas/Msg_Opt'
        - required: [ msg ]
    Name:
      properties:
        name: { type: string }
      required: [ name ]
    Id:
      properties:
        id:
          type: string
          format: uint64
      required: [ id ]
    PathRequest:
      type: object
      allOf:
        - $ref: '#/components/schemas/Msg'
        - $ref: '#/components/schemas/Name'
    PathResponse:
      type: object
      allOf:
        - $ref: '#/components/schemas/PathRequest'
        - $ref: '#/components/schemas/Id'

which fails on msg=message&name=some+name