What is the proper way to replace _id type from ObjectId to UUID in mongoose 6

[Freezystem]

I've read a lot of post in SO or GH where people are trying to implement UUIDs properly instead of ObjectIds. But these posts are a bit outdated for most of them or incomplete. I also wanted to avoid third party librairies like mongoose-uuid2.
The official documentation is not even mentioning the official UUID schema type.
I also have read that storing UUIDs as Buffer instead of String improve overall storage and index performance but it could be false.
Also it is not clear if I should use uuidv1 or uuidv4 generator as mongoose UUID type mention both in its source.

So for the moment I'm doing something like this:

import type { Schema } from "mongoose";
import { randomUUID } from "crypto";  // NodeJS implementation of uuid v4.

interface IUser {
    _id: Schema.Types.UUID;
    name: string;
    organization?: Schema.Types.UUID;
}

const userSchema = new Schema<IUser>({
    _id: {
        type: Schema.Types.UUID,
        default: randomUUID,
        immutable: true,
    },
    name: {
        type: String,
        required: true,
    },
    organization: {
        type: Schema.Types.UUID,
        ref: "Organization",
        index: true,
    }
},
{ _id: false });

But I get some errors, especially with the organization reference when I try to destructure a newly created user and organization isn't provided, example:

const {name, organization} = await User.create({name: "user"});

TypeError: Cannot read properties of undefined (reading 'toString')

at binary2hex (node_modules/mongoose/lib/schema/uuid.js:39:19)
at model.binaryToString (node_modules/mongoose/lib/schema/uuid.js:71:11)
at SchemaUUID.Object.<anonymous>.SchemaType.applyGetters (node_modules/mongoose/lib/schematype.js:1225:20)
at model.Object.<anonymous>.Document.get (node_modules/mongoose/lib/document.js:1886:18)
at model.get [as organization] (node_modules/mongoose/lib/helpers/document/compile.js:191:32)

Seems like the UUID getter is missing an undefined or null test before trying to cast it or maybe I'm missing something.
If I remove organization the error does not occur.