MongoDB findOneAndUpdate returns document that doesn't match the filter

I am trying to setup a findOneAndUpdate operation that will update a document if it matches 2 filters:

    const existingUser = await  this.userModel.findOneAndUpdate({id: id, accountId: acc._id},{$set: {name, properties}}, { new: true});

But Mongo is behaving very weirdly. In the example above, there is no document that matches the filters, so none should be returned, correct?

For some weird reason, it returns a document that matched the id condition. Even though that specific document does not have a accountId property.

This is the only document I have in the DB:

{
    "_id": "62987cceb0b3b13477efa888",
    "id": "7",
    "name": "Some Name",
    "properties": {
        "age": "39"
    },
    "__v": 0
}

When I set moongoose debug to true, I see this in the logs:

Mongoose: users.findOneAndUpdate({ id: '7' }, { '$set': { name: 'Luis Novo', properties: Map(1) { 'age' => '39' } } }, { upsert: false, remove: false, projection: {}, returnDocument: 'after', returnOriginal: false})

For some reason, it is not sending the second parameter.

What am I doing wrong?