Data Integrity Issue Repo

controllers.application\.js

import Controller from '@ember/controller';
import { inject as service } from '@ember/service';

/*
{
        data: {
          type: 'user',
          id: '1',
          attributes: {
            name: 'Chris',
          },
          relationships: {
            bestFriend: { data: { type: 'user', id: '2' } }
          }
        },
      included: [
        {
          type: 'user',
          id: '2',
          attributes: { name: 'Joao' }
        }
      ]
  	}
*/
function normalizeData(raw) {
	const data = {};
  const included = [
    {
      type: 'user',
      id: '2',
      attributes: { name: 'Joao' }
    },
    {
      type: 'user',
      id: '3',
      attributes: { name: 'James' }
    }
  ];
  
  const resource = data;
  resource.type = 'user';
  resource.id = String(data.id);
  const rawPrimaryRecord = raw.users[0];
  resource.attributes = rawPrimaryRecord;
  resource.relationships = {
    bestFriend: { data: { type: 'user', id: String(rawPrimaryRecord.bestFriendId) } }
  };

  return { data, included };
}

export default class ApplicationController extends Controller {
  @service store;
 
  appName = 'Ember Twiddle';

	constructor() {
  		super(...arguments);
      const normalizedData = normalizeData({
        users: [
          { id: 1, name: 'Chris', bestFriendId: 2 }
        ],
      	_users: [
        	{ id: 2, name: 'Joao' }
        ]
      });
    console.log(normalizedData);
    	this.user = this.store.push(normalizedData);
    const james = this.store.peekRecord('user', '3');
    this.user.bestFriend = james;
  }
}

models.user\.js

import Model from 'ember-data/model';

import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';


export default class extends Model {
  @attr name;
  @belongsTo('user', { async: false, inverse: null }) bestFriend;
  
  get bestFriendId() {
    return this.belongsTo('bestFriend').id();
  }
}

templates.application\.hbs

<h1>Welcome to {{this.user.name}}</h1>
<h2>Hello {{this.user.bestFriend.name}}</h2>
<h3>Real Best Friend ID is {{this.user.bestFriend.id}}</h3>
<h3>Best Friend ID is {{this.user.bestFriendId}}</h3>
<br>
<br>
{{outlet}}
<br>
<br>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-data": "3.18.0"
  }
}