Weird

components.my-component\.js

import TextField from '@ember/component/text-field';
import { computed } from '@ember/object'

export default TextField.extend({
  guitar: computed('value', {
    get() {
      return this.value + ' hello world'
    },
    set(value) {
      console.log(this.people)
      if (this.people && this.people.find(o => o.code == value)) {
      	this.set('value', this.options.find(o => o.code == value).code)
      }
      
      return value;
    }
  }),
})

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
	people = [
    { name: 'bob', code: 1 },
    { name: 'bill', code: 2 },
  ]
}

templates.application\.hbs

{{my-component
  people=this.people
	guitar=this.guitar
}}
  
<p>{{this.guitar}}</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": "3.11.1",
    "ember-template-compiler": "3.11.1",
    "ember-testing": "3.11.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}