CapacitorGoogleAuth: Problem with new MainActivity.java file.

Hello. I updated to android studio 4.2.1 and Capacitor 3 plugins. This new updates give an empty MainActivity.java file with only this lines:

package com.aplicationname.app;

import com.getcapacitor.BridgeActivity;

public class MainActivity extends BridgeActivity {
}

then I have to change to:

package com.aplicationname.app;

import android.os.Bundle;
import com.getcapacitor.BridgeActivity;
import com.codetrixstudio.capacitor.GoogleAuth.GoogleAuth;

public class MainActivity extends BridgeActivity {

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

        registerPlugin(GoogleAuth.class);
     }

}