Angular ngDoCheck() gets called even with ChangeDetectionStrategy.OnPush

Lets say i have a component structure like this:

AppComponent
    HeaderComponent
    ContentComponent
        TodosComponent
            TodoComponent

If I set HeaderComponent's changeDetection to ChangeDetectionStrategy.OnPush and change something in TodoComponent, still HeaderComponent's ngDoCheck(), ngAfterViewChecked() and ngAfterContentChecked() gets triggered.

What am I missing? Does ngDoCheck gets triggered anyway? If yes, how to determine if a component was checked by ChangeDetection?