ember restadapter observer not workling with peekAll

If I use some like this

application / route

model: @store.peekAll('account')

application / controller

modelDidChanged: Ember.observer('model', 'model.[].loaded', function() {
  log('model changed')
})

application / template

<somecomponent accounts=model>

somecomponent / component

accountsDidChanged: Ember.observer('accounts', 'accounts.[].loaded', function() {
  log('accounts changed')
})

somecomponent / template

each accounts as |acc|
  if acc.loaded
    <div>yes</div>
  else
    <div>no</div>

and then I update some property in account like this

@store.peekRecord('account', 1234).set('loaded', true)

component template will be correctly updated, but component and application observer will not be triggered