json-schema-validator/test/issue-311/schema.json

{
  "type": "object",
  "properties": {
    "element": {
      "$ref": "#/$defs/element"
    },
    "element2": {
      "$ref": "#/$defs/element/items/0/$defs/element2"
    }
  },
  "$defs": {
    "element": {
      "type": "array",
      "items": [
        {
          "$defs": {
            "element2": {
              "type": "string"
            }
          },
          "type": "number"
        }
      ]
    }
  }
}