unexpected behavior of swagger-cli

bar.yaml

post:
  responses:
    201:
      description: test
      content:
        application/json:
          schema:
            $ref: ref2.yaml
            description: the order of this description directive changes between versions

base.yaml

openapi: 3.0.3
info:
  title: Test
  version: 1.0.0
paths:
  /foo:
    $ref: foo.yaml
  /bar:
    $ref: bar.yaml

foo.yaml

post:
  responses:
    201:
      $ref: ref1.yaml

ref1.yaml

description: test
content:
  application/json:
    schema:
      type: object
      required:
        - test_param
      properties:
        test_param:
          $ref: ref2.yaml

ref2.yaml

type: object
required:
  - test
properties:
  test:
    type: integer
    example: 1