When I use a pipe in the context of a host attribute, as in the example below, it cannot be found even if I register it in that component:

@Component({
  selector: '[with-parenthesized-text]',
  host: {
    '[inner-html]': ' myText | parenthesize ' // <-- (1) using pipe here
  },
  pipes: [Parenthesize], // <-- (2) but registering it here is not enough
  template: ``
})

It results in the error: Cannot find pipe 'parenthesize'. It seems the pipe needs to be registered in the parent component. I suspect this is not intended behavior.

Here is a simple plunker to illustrate the issue.