Developing Discourse Plugins - Part 5 - Add an admin interface

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I found the Ember routing didn’t work until I commented out path: '/plugins' in the route-map file:

export default {
  resource: 'admin.adminPlugins',
  // path: '/plugins',
  map () {
    this.route('watch-mute')
  }
}

For some reason Ember was expecting a route at adminPlugins/watch-mute not at adminPlugins/plugins/watch-mute. Is this something I did wrong upstream in the routing call chain, or has something changed in the way Discourse/Ember handles these?