Component had no action handler for... Behaviour changes between ember 2.8.0 and 2.8.1

Please see this ember-twiddle.

What I want is to provide custom buttons with custom actions to a component. The component itself does not know about the actions involved, these actions are expected to bubble to the corresponding controller.

This code works in ember 2.8.0 but not in the current release version (2.8.2). Please use the twiddle to change between emberjs "2.8.0" and "release". Is this an emberjs bug?