anyOf openapi spec example (broken for openapi-generator)

gistfile1.txt

{
    "components": {
        "schemas": {
            "Reputation": {
                "properties": {
                    "fieldref": {
                        "title": "Fieldref",
                        "type": "string"
                    },
                    "mark": {
                        "title": "Mark",
                        "type": "string"
                    },
                    "ttl": {
                        "title": "Ttl",
                        "type": "integer"
                    }
                },
                "required": [
                    "fieldref",
                    "mark",
                    "ttl"
                ],
                "title": "Reputation",
                "type": "object"
            },
            "UsecaseData": {
                "properties": {
                    "reputation": {
                        "anyOf": [
                            {
                                "$ref": "#/components/schemas/Reputation"
                            },
                            {
                                "type": "null"
                            }
                        ],
                        "default": null
                    }
                },
                "required": [],
                "title": "UsecaseDataUUID",
                "type": "object"
            }
        }
    },
    "info": {
        "title": "anyof example",
        "version": "v1"
    },
    "openapi": "3.1.0",
    "paths": {
        "/api/v1/usecases": {
            "post": {
                "description": "",
                "operationId": "post_post_usecase",
                "parameters": [],
                "requestBody": {
                    "content": {
                        "application/json": {
                            "schema": {
                                "properties": {
                                    "reputation": {
                                        "anyOf": [
                                            {
                                                "$ref": "#/components/schemas/Reputation"
                                            },
                                            {
                                                "type": "null"
                                            }
                                        ],
                                        "default": null
                                    }
                                },
                                "required": [
                                ],
                                "title": "UsecaseData",
                                "type": "object"
                            }
                        }
                    }
                },
                "responses": {
                    "201": {
                        "content": {
                            "application/json": {
                                "schema": {
                                    "properties": {
                                        "reputation": {
                                            "anyOf": [
                                                {
                                                    "$ref": "#/components/schemas/Reputation"
                                                },
                                                {
                                                    "type": "null"
                                                }
                                            ],
                                            "default": null
                                        }
                                    },
                                    "required": [
                                    ],
                                    "title": "UsecaseDataUUID",
                                    "type": "object"
                                }
                            }
                        },
                        "description": ""
                    }
                }
            }
        }
    }
}