Query Params Not Updating With Refresh

controllers.application\.js

import Controller from '@ember/controller';

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

controllers.my-route\.js

import Controller from '@ember/controller';

export default Controller.extend({
  actions: {
    addQP() {
      return true;
    },
    
    refresh() {
      return true;
    }
  }
});

router\.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('my-route', { path: '/' });
});

export default Router;

routes.my-route\.js

import Route from '@ember/routing/route';

export default Route.extend({
  queryParams: {
    foo: { refreshModel: true }
  },
  
  model(params, transition) {
    let foo = transition.to.queryParams.foo || 'no QPs exist';
    console.log(`Query Params: ${transition.to.queryParams}`);
    
    return { foo };
  },
  
  actions: {
    addQP() {
      console.log('updating params');
      this.set('controller.foo', 'bar');
      //this.refresh();
    },
    
    refresh() {
      console.log('updating params and refreshing');
      this.set('controller.foo', 'stuff');
      this.refresh();
    }
  }
});

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<p>This demo renders the query param "foo" to the template if it exists, otherwise it says "no QPs exist".</p>
<p>Click the "Add a QP" button to see the value get updated and the model refreshed. Click the "add a QP and refresh" button to see the value get updated without the model receiving the correct query param upon refresh. In particular, this should work when `refreshModel` is set to false, allowing you to programmatically refresh the model using refresh() only when needed instead of every time the query param is updated.</p>
<br>
{{outlet}}
<br>
<br>

templates.my-route\.hbs

<button {{action 'addQP'}}>Add a QP</button>
<button {{action 'refresh'}}>Add a QP and refresh</button>

<p>{{model.foo}}</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"
  }
}