How to get the latest active item?

The following returns all active items.

activeItems: Ember.computed('items.@each.status', {
    get() {
        return this.get('items').filter((item) => {
            return item.get('active') === 'active';
        });
    }
})

// Template
{{#each activeItems as |activeItems|}}
  {{activeItem.status}}
{{/each}}

All of above works. Now lets say I want to create a computed property that picks out the last activeItem. I tried:

activeItem: Ember.computed('activeItems', {
  get() {
    return this.get('activeItems').lastObject;
  }
}),

// Template
{{activeItem.status}} <-- returns nothing

Why is this and how can I get it to work?