Use router of other tab without leaving the tab

I have a ionic 6 angular app with three tabs. In tab 2 a page is opened, Now I go to tab 1 and form there I want to navigate the tab 2 to the root page.
I emit an event in tab 1 the has a subscription in tab 2. When it fires I use in the handler : this.navCtrl.navigateBack(‘/tabs/tab2’);

The navigation works, but the app also automatically navigates from tab 1 to tab 2. But I want to stay in tab 1. I only want to modify the navigatinstack in tab 2. But I do not want to change the tabs.

Can anyone help me here?