Angular navigate parent

Hi, when I am using angular router-outlet and I try for example

this.router.navigate(['/detail/' + id], { relativeTo: this.route.parent });

my navigation works OK
but when I switch to ion-router-outlet it stop working because this.route.parent is null
at the same time I tried to check children in parent and its null too while when I use angular router outlet I see all children of the parent
Am I missing some import in Ionic or is it how it should works ?