Step attachments can't be previewed or downloaded from the test body section

[delatrie]

Describe the bug
Step attachments are missing in the step tree of a test. They can't be previewed or downloaded.

At the same time, the Attachments tab works as expected: the same attachments can be viewed and downloaded.

To Reproduce
Steps to reproduce the behavior:

1. Download and extract the input files:
   allure-results.zip
2. Generate and open the report:

   npx allure awesome ./allure-results
   npx allure open

3. Open the test details page (there will be only one test in the report).
4. Expand the test body.
5. Expand the Foo step. Note the missed label in the attachment row.
6. Expand the attachment. Note that the content is not shown.

Expected behavior
The Hello text is shown in the expanded attachment content area.

Screenshots

The test body misses the attachment content:

In contrast, the Attachments tab works as expected:

Videos

Screen.Recording.2025-05-07.at.01.03.38.mov

Desktop (please complete the following information):

• OS: Mac OS 15.4.1
• Browser MS Edge
• Version 135.0.3179.85

Additional context

URLs used to fetch the attachment content from the server differ. Example:

• In the test body: GET /data/attachments/648e81d3-1b08-4076-bdcc-ac34651016a8?attachment
• In the Attachments tab: GET /data/attachments/e76f050b0e27f70d01286d4dd50f6669.txt?attachment

Note that different UUIDs are used. Those are internal Allure 3 UUIDs: new values are created when a new report is generated.

In Allure2 (allure serve ./allure-results), everything works as expected.

Also, test-level attachments work as expected (the URLs are the same). An example of such test result would be:

{
  "name": "foo",
  "status": "passed",
  "steps": [
    {
      "name": "bar",
      "status": "passed",
      "attachments": [
        {
          "name": "bar",
          "source": "0ec9ddf1-e853-47b1-9d27-510bf4dbc2ab-attachment.txt",
          "type": "text/plain"
        }
      ],
      "start": 1746524896881,
      "stop": 1746524896881
    }
  ],
  "start": 1746524896881,
  "stop": 1746524896881,
  "uuid": "2cc4446b-8226-4cfd-8271-d3a0753a9fbf",
  "fullName": "foo"
}