Unclear semantics for the author affiliations field

[wammar]

It's unclear how the affiliations field of an author is computed.

For claimed author profiles, the field seems to reflect current affiliation as shown on their author profile, e.g.,

// 20230423141624
// https://api.semanticscholar.org/graph/v1/author/1780531?fields=affiliations

{
  "authorId": "1780531",
  "affiliations": [
    "Allen Institute of Artificial Intelligence",
    "University of Washington"
  ]
}

Some (all?) unclaimed author profiles that are not claimed have no affiliations, e.g.,

// 20230423141208
// https://api.semanticscholar.org/graph/v1/author/144590225?fields=affiliations

{
  "authorId": "144590225",
  "affiliations": [

  ]
}

Is this field intended to only provide information about the current affiliations of claimed author profiles? If so, we need to document this.