Searchbox API returns English results despite language parameter (e.g. 'fr')

mapbox-gl-js version: 3.11.0
browser: Chrome 136 on Linux

Hello Mapbox team,

I'm using the Mapbox Searchbox API with the suggest and retrieve endpoints. I'm using the language=fr parameter. However, the results returned often remain in English, even when the requested language is clearly specified and supported.
For example, when searching for "Bordeaux":

{
  "name": "Bordeaux Airport",
  "language": "fr",
  "poi_category": ["aéroport"],
  ...
},
{
"name": "Bordeaux Museum Fine Arts",
"name_preferred": "Bordeaux Museum of Fine Arts",
"language": "fr",
"poi_category": [
                "musée",
                "attraction touristique"
            ],
...
}

Despite language=fr, the name is "Bordeaux Airport" instead of the expected localized version, such as "Aéroport de Bordeaux". Similarly, for "Bordeaux Museum Fine Arts", the API returns English even though name_preferred, context, and poi_category show that the French context is correctly detected.

Problem:

The language field claims to be "fr", but the actual name or name_preferred is in English.

Expected Behavior:

When language=fr is specified, all returned name and name_preferred fields should be in French, not just metadata like categories or context.

Impact:

• This leads to a mixed-language UI, which confuses users and breaks localization expectations
• Requires manual filtering or overrides, which are not scalable
• Reduces the effectiveness of localized applications using the Searchbox API

Steps to reproduce:

1. *Make API Call: Link
2. Observe second result: "Bordeaux Airport"
3. It should be localized as "Aéroport de Bordeaux" or "Bordeaux aéroport"

*Request URL: https://docs.mapbox.com/playground/search-box/suggest-retrieve/?q=bordeaux&session_token=0d512dbd-e62c-4b78-8196-90efdffd0cfa&language=fr&proximity=-73.990593%2C40.740121&country=fr&endpoint=suggest

Reproduce the linked Searchbox suggest/retrieve request with language=fr and compare name and name_preferred with the localized metadata. No repository file or test is identified; first determine whether the behavior belongs to mapbox-gl-js or the external Searchbox API, then verify the resolution with the same request and expected French output.