flat vs nested get

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  flat = {
  	'some.nested.keys': 'flat'
	};
	
	nested = {
    some: {
      nested: {
        keys: 'nested'
      }
    }
  }
}

templates.application\.hbs

{{! this won't work}}
Flat: "{{get this.flat 'some.nested.keys'}}"

{{! this will work}}
Nested: "{{get this.nested 'some.nested.keys'}}"

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"
  }
}