Ionic - Onesignal - On handleNotificationReceived doesn't update view

Ionic Framework ionic-v3
1

I tried to update an array after received a notification from Onesignal like so:

getMsg.ts: (simplified)

getMsg = Array<Object> = [];
...
constructor( ... private oneSignal: OneSignal ... ) {
...

    this.oneSignal.handleNotificationReceived().subscribe( () => {

        this.getMessage();
        console.log('handleNotificationReceived');                
    } );
}

getMessage () {

    this.getMsg.push( { text: 'some text' } );

    console.log( 'getMessage' );

    // Push is working
    console.log( JSON.stringify( this.getMsg ) ); // [{"text":"some text"}]
}

getMsg.html:

...
<ion-list *ngFor="let m of getMsg">
    <ion-item>
        <p>{{ m.text }}</p>            
    </ion-item>
</ion-list>
...

But it doesn’t work as expected.

I have an <textarea> in my getMsg.html file, when I type in it, the view magically updates (after I receive a notification).

And obviously, if I use the function getMessage() directly, it works.

What I tried too, is to update/reload the view with:

this.navCtrl.setRoot( this.navCtrl.getActive().component );

but with no luck.

Ionic: v3.4.0
Cordova: v7.0.1