Why do x-prompt uses values instead of labels for list type

[Demianeen]

I took the following example from the Option for generators page:

{
  "style": {
    "description": "The file extension to be used for style files.",
    "type": "string",
    "default": "css",
    "enum": ["css", "scss", "sass", "less"],
    "x-prompt": {
      "message": "Which stylesheet format would you like to use?",
      "type": "list",
      "items": [
        {
          "value": "css",
          "label": "CSS"
        },
        {
          "value": "scss",
          "label": "SASS(.scss)  [ https://sass-lang.com   ]"
        },
        {
          "value": "sass",
          "label": "SASS(.sass)  [ https://sass-lang.com   ]"
        },
        {
          "value": "less",
          "label": "LESS         [ https://lesscss.org     ]"
        }
      ]
    }
  }
}

But instead of getting labels (uppercase in this case) I get values (lowercase values). Is this an expected behaviour? Because I couldn't find any issue about it. Then where are labels used? It seems an unexpected behaviour to me