.save() throws DocumentNotFoundError when writeConcern.w=0

[ekorolevanyrun]

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
When I use { writeConcern: { w: 0, j: false } } schema options I got the error DocumentNotFoundError: No document found for query "{ _id: new ObjectId("61f794106eb7091ff50bdc62") }" on model "X" after saving documents.

If the current behavior is a bug, please provide the steps to reproduce.
You have to run several mongodb instances, primary and several secondary databases. Then you have to define any model like:

const mongoose = require('mongoose');

const someSchema = new mongoose.Schema({
    version: {
        type: Number,
        default: 1
    },
    someField: String,
    anotherField: Number,
},{
    writeConcern: {
        w: 0,
        j: false
    }
});

const someModel = mongoose.model('some_model', someSchema);

and then after connection established

const newDoc = new someModel();
newDoc.save(function (err) {
    if (err) {
        // You got an DocumentNotFoundError here
         console.error(err);
});

What is the expected behavior?

Function .save executes without any error.

Since I set up writeConcern.w = 0 to the schema options, there is unnecessary block code https://github.com/Automattic/mongoose/blob/master/lib/model.js#L382#L421 which is not needed to be executed. get(options, 'w') returns undefined, despite the fact that options equals { writeConcern: { w: 0, j: false } }.

I assume that the problem is in https://github.com/Automattic/mongoose/blob/master/lib/helpers/schema/applyWriteConcern.js . 10, 13, 16 lines should be the same as 21, 24, 27.

What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.
Node: v14.18.1
Mongoose: 6.1.8
MongoDB server version: 5.0.5