input value reset on class change

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  dynamicClass: 0,
  
  actions: {
    updateClass() {
      this.incrementProperty('dynamicClass');
    },
  },
});

templates.application.hbs

Input with class binding
{{input value="test" classNameBindings="dynamicClass" key-up=(action "updateClass")}}

<br>

Input without class binding
{{input value="test"}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}