GitLab API endpoint GET /projects/:id/pipelines/:pipeline_id documentation is incorrect or am I doing this wrong?

Question

In the GitLab API documentation for pipelines, it states that this is available in the free, premium, and ultimate tiers. The following example is given for getting data back for multiple pipelines

curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/pipelines"

This will give you a list of dicts that looks like what is shown below.

{
    "id": 47,
    "iid": 12,
    "project_id": 1,
    "status": "pending",
    "source": "push",
    "ref": "new-pipeline",
    "sha": "a91957a858320c0e17f3a0eca7cfacbff50ea29a",
    "name": "Build pipeline",
    "web_url": "https://example.com/foo/bar/pipelines/47",
    "created_at": "2016-08-11T11:28:34.085Z",
    "updated_at": "2016-08-11T11:32:35.169Z"
  }

Further in the documentation, it states that you can access a single pipeline with the following example

curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/pipelines/46"

This supposodely gives you the content below

{
  "id": 287,
  "iid": 144,
  "project_id": 21,
  "name": "Build pipeline",
  "sha": "50f0acb76a40e34a4ff304f7347dcc6587da8a14",
  "ref": "main",
  "status": "success",
  "source": "push",
  "created_at": "2022-09-21T01:05:07.200Z",
  "updated_at": "2022-09-21T01:05:50.185Z",
  "web_url": "http://127.0.0.1:3000/test-group/test-project/-/pipelines/287",
  "before_sha": "8a24fb3c5877a6d0b611ca41fc86edc174593e2b",
  "tag": false,
  "yaml_errors": null,
  "user": {
    "id": 1,
    "username": "root",
    "name": "Administrator",
    "state": "active",
    "avatar_url": "https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon",
    "web_url": "http://127.0.0.1:3000/root"
  },
  "started_at": "2022-09-21T01:05:14.197Z",
  "finished_at": "2022-09-21T01:05:50.175Z",
  "committed_at": null,
  "duration": 34,
  "queued_duration": 6,
  "coverage": null,
  "detailed_status": {
    "icon": "status_success",
    "text": "passed",
    "label": "passed",
    "group": "success",
    "tooltip": "passed",
    "has_details": false,
    "details_path": "/test-group/test-project/-/pipelines/287",
    "illustration": null,
    "favicon": "/assets/ci_favicons/favicon_status_success-8451333011eee8ce9f2ab25dc487fe24a8758c694827a582f17f42b0a90446a2.png"
  }
}

I've used the first API endpoint to get a list of pipeline IDs and then tried to use the second endpoint to get this additional information. However, when I try the second endpoint, I get the same data values from the endpoint that returns the list of pipelines.

Is this documentation wrong or am I missing something here? Is there a way for me to get the duration of a pipeline using this or another method?