[BUG] [typescript-fetch] PATCH requestBody overwrites DELETE requestBody

Bug Report Checklist

Description

When a PATCH and DELETE endpoint are registered under the same path, the requestBody from the PATCH endpoint is copied over to the requestBody from in the DELETE endpoint. While the DELETE endpoint has no requestBody defined at all.

openapi-generator version

docker openapitools/openapi-generator-cli:v6.2.0

OpenAPI declaration file content or url

/some/route/{id}:
    delete:
      tags:
        - Bookings
      parameters:
        - name: id
          in: path
          schema:
            type: string
          required: true
      responses:
        '200':
          description: Booking request successfully deleted

    patch:
      tags:
        - Bookings
      parameters:
        - name: id
          in: path
          schema:
            type: string
          required: true
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                reason:
                  type: string
                  nullable: true
      responses:
        '200':
          description: Success

Generation Details

Typescript outputs:

export interface SomeRouteIdPatchRequest {
    id: string;
    SomeRouteIdDeleteRequest?: SomeRouteIdDeleteRequest;
}

export interface SomeRouteIdDeleteRequest {
    /**
     * @type {string}
     * @memberof SomeRouteIdDeleteRequest
     */
    reason?: string | null;
}

    async someRouteIdDelete(requestParameters: SomeRouteIdDeleteRequest, initOverrides?: RequestInit | runtime.InitOverrideFunction): Promise<void> {
        await this.someRouteIdDeleteRaw(requestParameters, initOverrides);
    }

As you can see, the reason field is suddenly a required field in the delete call, while it should only require the id parameter and no request body at all.

Reproduce the issue with the supplied OpenAPI declaration using openapitools/openapi-generator-cli:v6.2.0 and the typescript-fetch output. Inspect generation around SomeRouteIdPatchRequest and someRouteIdDelete; done means DELETE requires only id with no reason request body, while PATCH retains its own request body.