[BUG] Property with oneOf leads to wrong Typescript

Description

Generating Typescript Clients with a schema that have a property including "oneOf" gets rendered wrong.

openapi-generator version

6.4.0

OpenAPI declaration file content or url

Generation Details

Following the swagger:

"CarFactoryCreate": {
        "type": "object",
        "properties": {
          "vehicles": {
            "type": "array",
            "items": {
              "oneOf": [
                {
                  "$ref": "#/components/schemas/CarCreate"
                },
                {
                  "$ref": "#/components/schemas/BikeCreate"
                },
                {
                  "$ref": "#/components/schemas/BycicleCreate"
                }
              ],
              "description": ""
            },
            "description": "",
            "nullable": true
          }
        },
        "additionalProperties": false,
        "description": ""
      },

leads to the following generation that is obvisiously wrong:

import type { CarCreate | BikeCreate | BycicleCreate } from './CarCreate | BikeCreate | BycicleCreate';
import {
    CarCreate | BikeCreate | BycicleCreateFromJSON,
    CarCreate | BikeCreate | BycicleCreateFromJSONTyped,
    CarCreate | BikeCreate | BycicleCreateToJSON,
} from './CarCreate | BikeCreate | BycicleCreate';

Steps to reproduce

Having the mentioned swagger, run generate "typescript-fetch" with interfaces= false

Start by reproducing the issue with the provided OpenAPI schema using the typescript-fetch generator and interfaces=false. Inspect the generator path that handles array items with oneOf; done means the generated TypeScript imports and union type references are valid rather than using a union as a filename.