Instance initializer changes between 1.13.x and 2.x.x?

@swaggaguru wrote:

I've just upgraded my app from 1.13.8 to 2.4.x.

I'm seeing something odd happening in my instance-initializer:

import Ember from 'ember';

Ember.$(document).on('custom-event', function () {
  alert('hello');
});

export function initialize (instance) {
}

export default {
  name: 'yard-interface',
  initialize: initialize
};

The custom event is fired by a third-party script that is asynchronously loaded (it's loaded pretty quick though). In Ember 1.13.8 the event was correctly fired. In Ember 2.4.x the event callback doesn't trigger - seems a race condition is happening here and I'm unable to pin down what's happening.

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