Ionic push notification stopped after CLI upgrade to 3.12.0

I have an application developed with Ionic 2, the Ionic itself is no upgraded, but I upgraded the CLI from 2.2.1 to 3.12.0 for App startup performance enhancement (it went down from 9 seconds to 2 seconds). Nevertheless, I have a problem that the push notifications no longer arrive or at least no longer appear in the status bar if it arrives. I build an Android apk and installed it on the phone and discovered this behaviour.

I am on “cordova”: “6.5.0” - “@ionic-native/push”: “^3.6.1”

Any help would be very useful, I sure can post more code snippets if required.