ember-data unload issue 3.28

components.my-component\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';
import { inject as service } from '@ember/service';

export default class extends Component {
  @service router;
  
  @action async delete() {
    const a = this.args.a;
    const b = a.b;
    
    await a.destroyRecord();
    this.router.transitionTo('b', b.get('id'));
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

models.a\.js

import Model, { belongsTo } from '@ember-data/model';

export default class extends Model {
  @belongsTo b;
}

models.b\.js

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

export default class extends Model {
  @hasMany a;
}

router\.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('a', { path: '/a/:id' });
  this.route('b', { path: '/:id' });
});

export default Router;

routes.a\.js

import Route from '@ember/routing/route';
import { inject as service } from '@ember/service';

export default class ARoute extends Route {
  @service store;
  
  model({ id }) {
    return this.store.peekRecord('a', id);
  }
}

routes.application\.js

import Route from '@ember/routing/route';
import { inject as service } from '@ember/service';

export default class extends Route {
  @service store;

  beforeModel() {
    const b = this.store.createRecord('b', { id: 1 });
    this.store.createRecord('a', { id: 1, b, title: 'Foo' });
    this.store.createRecord('a', { id: 2, b, title: 'Bar' });
    this.store.createRecord('a', { id: 3, b, title: 'Baz' });
  }
}

routes.b\.js

import Route from '@ember/routing/route';
import { inject as service } from '@ember/service';

export default class BRoute extends Route {
  @service store;

  model({ id }) {
    return this.store.peekRecord('b', id);
  }
}

routes.index\.js

import Route from '@ember/routing/route';
import { inject as service } from '@ember/service';

export default class IndexRoute extends Route {
  @service router;
  @service store;
  
  beforeModel() {
    const bs = this.store.peekAll('b');
    this.router.transitionTo('b', bs.firstObject.id);
  }
}

templates.a\.hbs

<MyComponent @a={{@model}} />

templates.application\.hbs

{{outlet}}

templates.b\.hbs

<h1>"B" index</h1>

<ul>
{{#each @model.a as |a|}}
   <li>
   	<LinkTo @route="a" @model={{a.id}}>{{a.title}}</LinkTo>
   </li>
 {{/each}}
 </ul>

templates.components.my-component\.hbs

{{@a.title}}
<button type="button" {{on "click" this.delete}}>Delete</button>

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": "3.28.3"
  }
}