EmberJS "assertion failed: calling set on destroyed object" after unloading and reloading models

I'm having trouble unloading data models and having them properly re-populate when API calls are made.

The models:

/* Model Foo */
export default DS.Model.extend({
  bars: DS.hasMany('bar', { async: true })
});

/* Model Bar */
export default DS.Model.extend({
  foo: DS.belongsTo('foo', { async: true, inverse: 'bars' })
});

At a point in the app, both foo and bar are unloaded from ember data store and then reloaded from an API call. Like so:

/* Unload and reload snippet */
this.store.unloadAll('bar');
this.store.unloadAll('foo');

let bars = this.store.filter('bar', { 
  queryParam: x 
}, function(bar) {
  return x === bar.x
});

let foos = this.store.filter('foo', { 
  queryParam: y 
}, function(foo) {
  return y === bar.y
});

let self = this;
Ember.RSVP.all([foos, bars]).finally(function() {
  self.controller.set('model.foos', foos);
  self.controller.set('model.bars', bars);
});

The problem arises in a computed property that is dependent on these model changes.

/* Computed property elsewhere in app */
compProp: Ember.computed('foo.bars.[]', function() {
  let tmp = this.get('foo.bars'); /* <-- Error generating line */
  .
  .
  .
})

This line gives me the following error: Assertion Failed: calling set on destroyed object: <DS.PromiseManyArray:ember1995>.content = <DS.ManyArray:ember3320>

Thanks for any help!

Side notes:

• I'm aware store.filter() is deprecated. I'm upgrading the app from an earlier Ember version and using ember-data-filter addon for temporary compatibility.
• This was working on Ember 1.13.