Angular Dynamic forms patchValue doesn't work for checkbox

Question

Here is the plunker with this issue. This plunker is based on this angular dynamic forms example:

I have tried to patch this form with some model as shown in the screenshot below, here the code:

  ngOnInit() {
    this.form = this.qcs.toFormGroup(this.questions);
    this.form.patchValue({
      emailAddress: '[email protected]',
      agree: true
    })
  }

As you can see the email address field is patched fine, but for some reason checkbox is not initialising its value.

Can't find any bug with this description online.

Any idea?