[BUG][typescript] Array items are incorrectly marked as nullable

[HitkoDev]

Description

Under some very specific conditions, | null is added to array item type when it shouldn't be there.

openapi-generator version

7.22.0

OpenAPI declaration file content or url

{
    "info": {
        "description": "Test",
        "title": "test",
        "version": "1.0"
    },
    "openapi": "3.1.0",
    "servers": [
        {
            "url": "http://localhost:5000"
        }
    ],
    "components": {
        "schemas": {
            "Response": {
                "title": "Response",
                "type": "object",
                "properties": {
                    "nullable": {
                        "type": "array",
                        "default": null,
                        "items": {
                            "anyOf": [
                                {
                                    "type": "string"
                                },
                                {
                                    "type": "null"
                                }
                            ]
                        }
                    }
                },
                "required": [
                    "nullable"
                ]
            },
            "ResponseGet": {
                "title": "ResponseGet",
                "type": "object",
                "properties": {
                    "nonNullable": {
                        "type": "array",
                        "default": null,
                        "items": {
                            "type": "string"
                        }
                    }
                },
                "required": [
                    "nonNullable"
                ]
            }
        }
    },
    "paths": {
        "/api": {
            "get": {
                "responses": {
                    "200": {
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/ResponseGet"
                                }
                            }
                        },
                        "description": "OK"
                    }
                }
            }
        }
    }
}

Generation Details

{
    "generatorName": "typescript"
}

Steps to reproduce

When generating code for the above API spec, the Response class should have 'nullable': Array<string | null>; and the ResponseGet class should have 'nonNullable': Array<string>;. Instead, both receive Array<string | null>;. I'm unable to determine the exact cause; for example, changing "#/components/schemas/ResponseGet" -> "#/components/schemas/Response" causes both models to be generated correctly. Removing "default": null also seems to somehow fix the bug.