_id: null on returned document when using .create() or .save() about mongoose HOT 2 CLOSED

import { model, Schema, Types, connect, connection } from "mongoose";


interface ISavedAttribute {
    attributeId: number,
    attributeName: string,
    productId: number,
    displayName: string,
    displayOn: [string]
}

const savedAllmoxyAttributes = new Schema(
  {
    _id: { type: Types.ObjectId, default: () => new Types.ObjectId() },
    attributeId: { type: Number, required: true },
    attributeName: { type: String, required: true },
    productId: { type: Number, required: true },
    displayName: { type: String, required: true },
    displayOn: { type: [String], required: true },
  },
  { collection: "allmoxy", timestamps: true }
);

const AllmoxySavedAttribute = model<ISavedAttribute>(
  "allmoxy-saved-attributes",
  savedAllmoxyAttributes
);

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

    const existingEntry = await AllmoxySavedAttribute.findOne();

    if (existingEntry)
        return this.returnError(
        "An object with that attribute ID already exists!"
        );

    const createdEntry = await AllmoxySavedAttribute.create({
        attributeId: 1,
        attributeName: 'Test',
        productId: 1,
        displayName: 'test testerson',
        displayOn: ['Test']
    });

    console.log(createdEntry);
    console.log(createdEntry._id)
}

run();