modified twice bug

components.my-component\.js

import Component from '@ember/component';
import { computed } from '@ember/object';

export default Component.extend({
  
  init() {
    this._super(...arguments);
    this.onUpdate(false);
  },
  
  greeting: computed('name', function(){
    return "Hello " + this.get('name');
  }),
    
});

components.parent-component\.js

import Component from '@ember/component';


export default Component.extend({
  name: false,
  
  actions: {
    onUpdate: function(_name){
			this.set('name', _name);
    }
  }
});

controllers.application\.js

import Controller from '@ember/controller';

export default Controller.extend({
  appName: 'Modified Twice Bug'
});

templates.application\.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{parent-component}}
<br>
<br>

templates.components.my-component\.hbs

{{greeting}}

templates.components.parent-component\.hbs

{{my-component 
	name=name 
  onUpdate=(action 'onUpdate')
  }}
  
  
{{my-component 
	name=name 
  onUpdate=(action 'onUpdate')
  }}

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": "2.18.2",
    "ember-template-compiler": "2.18.2",
    "ember-testing": "2.18.2"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}