Warning with "default" value

[boutils]

Hello, I am trying to use a simple selector.

This is the schema I am using:

{
  "type": "object",
  "properties": {
    "indicator": {
      "type": "string",
      "default": "aa",
      "enum": ["aa", "bb"]
    }
  }
}

Note that it seems to work correctly, but I can see in my browser console the following warning (several times in a row):

Is this schema wrong? Or is it a bug?

Thanks in advance for your help.