Activity Lifecycle changed with API 25 (7.1.1)

In my MainActivity, I have a dialog which is opened if a flag in the intent is set. If the dialog was created, it is dismissed in onPause()

@Override
public void onPause() {
    super.onPause();
    if (_dialog!= null) {
        _dialog.dismiss();
        _dialog= null;
    }
}

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    if (intentContainsFlag) {
        _dialog = ....;
        _dialog.show();
    }
}

The dialog is to be opened if a ListView holder's button is pressed and builds an intent URI:

bttn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // The URL scheme is registered in the intent filter
            String intentString = "http://open.example.com/myParameters";
            v.getContext().startActivity(new Intent(Intent.ACTION_VIEW,
                                                    Uri.parse(intentString)));
        }
    });

The AndroidManigfest contains:

<activity
    android:name=".MainActivity"
    android:label="@string/app_name"
    android:launchMode="singleTask"
    android:screenOrientation="landscape" >
    <intent-filter>
      <action android:name="android.intent.action.VIEW" />
      <category android:name="android.intent.category.DEFAULT"/>
      <category android:name="android.intent.category.BROWSABLE"/>
      <data android:scheme="http" android:host="open.example.com" android:pathPattern=".*"/>
      <data android:scheme="https" android:host="open.example.com" android:pathPattern=".*"/>
    </intent-filter>
....

The sdk versions are set to

minSdkVersion = 19
targetSdkVersion= 22
compileSdkVersion = 23
buildToolsVersion = 23

On Android < 7.1.1, everything works as expected: onNewIntent() is called and the dialog is visible.

But on 7.1.1. devices the MainActivity's onNewIntent is called, then directly afterwards onPause and onResume. This means that the activity opens itself / comes to the foreground but the dialog was immediately closed.

A possible workaround is to close the dialog in onStop() but I don't get why this happens on Android 7.1.1 - was something changed in the life cycle ?