lean transform doesn't work & not return doccument

[Hagriel]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

6.4.6

Node.js version

18.5

MongoDB server version

5.0.9

Description

the problem described in #12093 is not fixed

and in version 6.4.6 lean on the second level with transform not return any result

Steps to Reproduce

this.favoriteListModel
      .find({ userId })
      .populate({
        path: 'user',
        select: 'fullName avatar',
        transform: transform: (document: mongoose.Document, rec: mongoose.Document): mongoose.Document => {
                 delete document?._id;
                 delete document?.__v;

                 return document;
          },
      })
      .lean({
           virtuals: ['id', 'dataType'],
           transform: (document: mongoose.Document, rec: mongoose.Document): mongoose.Document => {
                 delete document?._id;
                 delete document?.__v;

                 return document;
          },
     });

Expected Behavior

Expected

{
    "id": "62d5d505e570e2fb20105b04",
    "title": "test list 1",
    "description": "test description",
    "user": {
      "fullName": "alex zed"
    },
    "dataType": "list"
  },

Now in v6.4.6 I get

{
    "_id": "62d5d505e570e2fb20105b04",        /// must not be
    "id": "62d5d505e570e2fb20105b04",
    "title": "test list 1",
    "description": "test description",
    "user": null,                             /// No data
    "dataType": "list"
  },

[IslandRhythms]

const mongoose = require('mongoose');

const testSchema = new mongoose.Schema({
    name: String,
    item: {
        type: mongoose.Types.ObjectId,
        ref: 'Reference'
    }
});

const referencedSchema = new mongoose.Schema({
    title: String
});

const Test = mongoose.model('Test', testSchema);

const Reference = mongoose.model('Reference', referencedSchema);


async function run() {
    await mongoose.connect('mongodb://localhost:27017');
    await mongoose.connection.dropDatabase();

    const reference = await Reference.create({
        title: 'The referenced document'
    });

    await Test.create({
        name: 'Test Testerson',
        item: reference._id
    });

    let test = await Test.findOne().populate('item');
    
    console.log(test);

    test = await Test.findOne().populate('item').lean({transform: (doc) => {
        delete doc._id;
        delete doc.__v;
        return doc;
    }});

    console.log(test);
}

run();

[vkarpov15]

The issue is more due to deleting _id, which is making it hard for populate to map the populate result document to the top level document.