Missing properties after upgrade 1.21.0 to 1.21.1

[frodeaa]

Upgrade from 1.21.0 to 1.21.1 breaks request body properties
for swagger file where allOf is used

1.21.0

1.21.1

{
  "consumes": [
    "application/json"
  ],
  "produces": [
    "application/json"
  ],
  "swagger": "2.0",
  "info": {
    "description": "",
    "title": "",
    "version": "2018-02-23"
  },
  "basePath": "/v1",
  "paths": {
    "/users": {
      "post": {
        "summary": "",
        "parameters": [
          {
            "name": "data",
            "in": "body",
            "required": true,
            "schema": {
              "type": "object",
              "allOf": [
                {
                  "$ref": "#/definitions/AuthUser"
                },
                {
                  "required": [
                    "password"
                  ],
                  "properties": {
                    "password": {
                      "description": "The user's password",
                      "type": "string",
                      "minLength": 8
                    }
                  }
                }
              ]
            }
          }
        ],
        "responses": {
          "200": {
            "description": "user created",
            "schema": {
              "$ref": "#/definitions/AuthUser"
            }
          }
        }
      }
    }
  },
  "definitions": {
    "AuthUser": {
      "type": "object",
      "allOf": [
        {
          "$ref": "#/definitions/Entity"
        },
        {
          "required": [
            "username"
          ],
          "properties": {
            "username": {
              "type": "string"
            }
          }
        }
      ]
    },
    "Entity": {
      "type": "object",
      "properties": {
        "id": {
          "type": "string",
          "example": "1234"
        }
      }
    }
  },
  "parameters": {}
}

consumes:
  - application/json
produces:
  - application/json
swagger: '2.0'
info:
  description: ''
  title: ''
  version: '2018-02-23'
basePath: /v1
paths:
  /users:
    post:
      summary: ''
      parameters:
        - name: data
          in: body
          required: true
          schema:
            type: object
            allOf:
              - $ref: '#/definitions/AuthUser'
              - required:
                  - password
                properties:
                  password:
                    description: The user's password
                    type: string
                    minLength: 8
      responses:
        '200':
          description: user created
          schema:
            $ref: '#/definitions/AuthUser'
definitions:
  AuthUser:
    type: object
    allOf:
      - $ref: '#/definitions/Entity'
      - required:
          - username
        properties:
          username:
            type: string
  Entity:
    type: object
    properties:
      id:
        type: string
        example: '1234'
parameters: {}

[RomanHotsiy]

@frodeaa thanks for reporting and for detailed test-case!

version v1.21.2 has just been released