repro of EC set on destroyed item

components.person-item.js

import Ember from 'ember';
import { task } from 'ember-concurrency';

const PersonItem = Ember.Component.extend({
  person: null,
  editMode: false,
  changePerson: null,
  
  latestPost: Ember.computed.oneWay('person.latestPost'),
  
  willDestroyElement() {
    this._super(...arguments);
    console.log('element is getting destroyed');
  },
  
  actions: {
    startEdit() {
      this.set('editMode', true);
    }
  },
  
  saveEdit: task(function* () {
  	let cp = this.get('changePerson');
    let result = cp();
    yield result;
    this.set('editMode', false);
  })
});

PersonItem.reopenClass({
  positionalParams: ['person']
});

export default PersonItem;

components.person-outer-item.js

import Ember from 'ember';

const { Component, computed, isEmpty } = Ember;

const PersonOuterItem = Component.extend({
  person: null, // the device setting object

  // changeSetting is a function that takes a SettingChangeRequest as an
  // argument, called when trying to apply a setting change.
  changePerson: null,

  tagName: '', // no tag, this just wraps other components,
  
  componentName: computed('person', () => {
    return 'person-item';
  }),

  willDestroyElement() {
    this._super(...arguments);
    console.log('parent element is getting destroyed');
  }
});

PersonOuterItem.reopenClass({
  positionalParams: ['person']
});

export default PersonOuterItem;

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

routes.application.js

import Ember from 'ember';
import { task, timeout } from 'ember-concurrency';

export default Ember.Route.extend({
  model() {
    this.set('n', 0);
    let result = Ember.Object.create({
      people: [
        {id: 1, name: "Blake", latestPost: {id: 5, body: 'foo'}}
      ]
    });
    this.set('peopleModel', result);
    return result;
  },
  
  actions: {
    changePerson() {
      return this.get('_changePerson').perform();
    }
  },
  
  _changePerson: task(function * () {
    console.log("Waiting...");
    yield this.get('updateModel').perform();
    console.log("Done");
  }),
  
  updateModel: task(function* () {
    this.set('n', this.get('n') + 1);
    let n = this.get('n');
    yield new Ember.RSVP.Promise((resolve, reject) => {
      Ember.run.later(500, resolve);
    });
    this.get('peopleModel').setProperties({
      people: [
        {id: 1, name: "Blake"+n, latestPost: {id: n+20, body: 'foo'+n}}
      ]
    });
  })
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#each model.people as |person|}}
  {{person-outer-item person=person changePerson=(route-action "changePerson")}}
{{/each}}
<br>
<br>

templates.components.person-item.hbs

{{#if editMode}}
	<h2>Editing {{person.name}}</h2>
  <button onclick={{perform saveEdit}}>Save</button>
{{else}}
  <h2>Not editing {{person.name}}</h2>
  <button {{action "startEdit"}}>Edit</button>
{{/if}}
<p>latest post: {{latestPost.body}}</p>

templates.components.person-outer-item.hbs

{{component componentName person changePerson=changePerson}}

twiddle.json

{
  "version": "0.10.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-template-compiler": "2.9.0"
  },
  "addons": {
    "ember-concurrency": "latest",
    "ember-route-action-helper": "2.0.0"
  }
}