Basic Authentication (auth:) is not working in Artillery

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I think auth: (Basic Authentication) no longer works as described in the documentation

Version info:

Artillery: 2.0.20
Node.js:   v22.8.0
OS:        darwin

A test.yaml file:

config:
  target: http://asciiart.artillery.io:8080
  phases:
    - duration: 1
      arrivalRate: 1
scenarios:
  - flow:
      - get:
          url: '/dino'
          auth:
            user: username
            pass: password

Run the test with debug mode enabled to inspect request headers:

DEBUG=http* artillery run test.yaml -s

I expected to see this happen:

I expected to see the Authorization header in the request headers.

Instead, this happened:

No Authorization header was present in the request.