Response validation does not work when multiple response content-types are defined in the API

[tomasvalentaopenbean]

Are you using jest or chai?
Chai

Are you using OpenAPI 2, 3.0.X, or 3.1.0?
3.0.3

Describe the bug clearly
When API has defined multiple content-types as possible responses, the validation only picks up the first defined content-type and fails when the API returns the other content-type in the response.

Steps to reproduce the bug:

1. Define an API that returns 2 content-types:

get:
  summary: Get Something
  operationId: getSomething
  responses:
    '200':
      content:
        text/csv:
          schema:
            type: string
            format: binary
        application/json:
          schema:
            type: array
            items:
              type: string

2. Send a request that generates the 2nd content-type as a response
3. An error is received (see below)

 AssertionError: expected res to satisfy API spec

expected res to satisfy the '200' response defined for endpoint 'GET /something' in your API spec

res did not satisfy it because: response must be string

res contained: {
  body: [
    'text1',
    'text2',
    'text3',
    'text4',
    'text5'
  ]
}

The '200' response defined for endpoint 'GET /something' in API spec: {
  '200': {
    description: "Get something.",
    content: {
      'text/csv': { schema: { type: 'string', format: 'binary' } },
      'application/json': {
        schema: { type: 'array', items: { type: 'string' } } }
      }
    }
  }
}

What did you expect to happen instead?
Validation should pass because the response is valid.

Are you going to resolve the issue?