Bug when sorting hasMany

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { sort } from '@ember/object/computed';
import { A } from '@ember/array';

export default class ApplicationController extends Controller {
  appName = 'test'

  get services() {
    return this.model.services;
  }

  get sortedServices() {
    return this.model.services.sortBy('name');
  }

  get sortedThroughBusinessServices() {
    return this.model.business.services.sortBy('name');
  }

	_sortParams = ['name']
	@sort('model.services', '_sortParams') sortedServicesComputed

  @action addService() {
    const business = this.model.business;
    const name =  Math.round(Math.random()) ? 'John' : 'Doe';
		const service = this.store.createRecord('service', { name, business }); 
  }
}

models.business\.js

import Model, { hasMany } from '@ember-data/model';
/*
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';
*/

export default class extends Model {
  @hasMany('service', { inverse: 'business' }) services
}

models.service\.js

import Model, { attr, belongsTo } 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('business', { inverse: 'services' }) business
}

routes.application\.js

import Route from '@ember/routing/route';

export default class extends Route {
  async model() {
    const business = this.store.createRecord('business');
    const services = await business.services;
    return { business, services: services };
  }
}

templates.application\.hbs

<button {{on "click" this.addService}}>Add service</button>
<h3>unsortted ({{this.services.length}})</h3>
<ul>
  {{#each this.services as |service|}}
    <li>{{service.name}}</li>
  {{/each}}
</ul>

<hr>

<h3>sorted (computed) ({{this.sortedServicesComputed.length}})</h3>
<ul>
  {{#each this.sortedServicesComputed as |service|}}
    <li>{{service.name}}</li>
  {{/each}}
</ul>

<hr>

<h3>sorted through business ({{this.sortedThroughBusinessServices.length}})</h3>
<ul>
  {{#each this.sortedThroughBusinessServices as |service|}}
    <li>{{service.name}}</li>
  {{/each}}
</ul>

<hr>

<h3>sorted ({{this.sortedServices.length}}) - always empty :(</h3>
<ul>
  {{#each this.sortedServices as |service|}}
    <li>{{service.name}}</li>
  {{/each}}
</ul>

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": "1.0.1",
    "ember-data": "3.21.0"
  }
}