Infinite rendering error in Octane preview displaying models sorted in component

[CodingItWrong]

I get an "infinite rendering error detected" when I do the following in the Octane preview:

• The route loads some models
• The models are passed directly into a component
• The component sorts the models
• The sorted models are used as the options for Ember Paper Select

Things that don't cause the error:

• If you sort the models in the controller instead of in the component, you don't get the error
• If you simply render the sorted models with an {{#each}}, instead of passing them into a Paper Select, you don't get the error
• Doing all of the above on Ember 3.9.0 stable (instead of the Octane preview) doesn't result in the error

Minimal reproduction: https://github.com/CodingItWrong/octane-paper-sort

The following is how I am doing the sorting in the component:

export default class WidgetFormComponent extends Component {
  sortProperties = Object.freeze(['id:desc']);

  @sort('args.widgets', 'sortProperties')
  sortedWidgets;
}

Then invoking like so:

{{#paper-select
  label="Widget"
  options=this.sortedWidgets
  selected=this.selectedWidget
  onChange=(action (mut this.selectedWidget))
  as |widget|
}}
  {{widget.name}}
{{/paper-select}}