Push page to navstack in app.component - not responding

Hi,
maybe someone can help me.

If i try to push a page to the navigation stack in my app.component within a nfc listener subscribe the new page is visible but not responding (unable to click, switch input,…)

If i push the outside the nfc listener all works fine

Simple project

Code
app.component.ts
if (this.platform.is(‘cordova’)) {
this.nfc.addNdefListener(() => {
console.log(‘successfully attached ndef listener’);
}, (err) => {
console.log(‘error attaching ndef listener’, err);
}).subscribe(event => {
this.nav.push(TestpagePage).then(res => {
console.log(‘ok’)
console.log(res)
}).catch(e => {
console.log(‘error’)
console.log(e)
})
});
}

Ionic info
cli packages:

@ionic/cli-utils  : 1.19.1
ionic (Ionic CLI) : 3.19.1

global packages:

cordova (Cordova CLI) : 7.0.1

local packages:

@ionic/app-scripts : 3.1.8
Cordova Platforms  : android 6.2.3
Ionic Framework    : ionic-angular 3.9.2

System:

Android SDK Tools : 26.1.1
Node              : v6.11.2
npm               : 5.6.0
OS                : Windows 10

Misc:

backend : legacy

Thanks