ember-concurrency async arrow fn issue

controllers.application\.js

import Controller from '@ember/controller';
import { action } from "@ember/object";
import { tracked } from "@glimmer/tracking";
import { task, timeout, waitForProperty } from 'ember-concurrency';

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

  @tracked lol = false;

  @task
  foo = task(async () => {
    this.lol = false;
    let val = await waitForProperty(this, 'lol');
    return val;
  });

  @action
  setLolToTrue() {
    this.lol = Math.random();
  }
}

templates.application\.hbs

<h1>Welcome to ember-concurrency</h1>

<p>
Use this twiddle as a jumping off point for your ember-concurrency
experiments / bug reports.
</p>

<p>
  <button {{on "click" (perform this.foo)}}>
    Perform foo
  </button><br>
</p>

<p>
  state: {{this.foo.state}}<br>
  last.value: {{this.foo.last.value}}
</p>

<p>
<button {{on "click" this.setLolToTrue}}>
  Set Lol to true
</button>
</p>

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-concurrency": "2.3.4"
  }
}