WebView inside NestedScrollView cannot be scrolled

I've got an activity that use WebView to load the web content. The problem arise when I want to implement Flexible Space with image. I can expand and collapse the Toolbar, but when the Toolbar already collapsed, The scrollbar stuck there. I can't scroll the content inside the WebView.

This is the XML:

<android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipToPadding="false"
    android:fillViewport="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <WebView
        android:id="@+id/read_full_content_wv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>


</android.support.v4.widget.NestedScrollView>

Do you have any solution for this?

Regards, Elmer

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EDIT After I look at the link that given by LinX64. I tried to add:

public class FullContentActivity extends AppCompatActivity {
   ...
   @Override
   protected void onCreate(Bundle savedInstance){
      ...
      WebView webView = (WebView) findViewById(R.id.read_full_content_wv);
      webView.setWebViewClient(new MyBrowser());
      webView.loadData(extra.get(1).toString(), "text/html", "utf-8");
      ...
   }
   ...
   private class MyBrowser extends WebViewClient {
      @Override
      public void onPageStarted(WebView view, String url, Bitmap favicon){
         NestedScrollView nsv = (NestedScrollView) findViewById(R.id.nsv_fc);
         nsv.scrollTo(0,0);
      }
   }
}

and still got stucked.

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EDIT 2 FYI: I tried on ASUS Zenfone 6 - KitKat 4.4.2 Is it possible KitKat can't load it correctly?

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EDIT 3: The best solution I've got for this question

After working around, I think I cannot get experience I want for Flexible Space using CollapsingToolbarLayout combined with WebView, so I changed WebView to TextView and use Html.fromHtml() to read the content. Unless Google gonna update or fix some features so we can combine CollapsingToolbarLayout and WebView together.

Got this one working with changing the height attribute of the underlying Webview.

For NestedScrollView use attribute

android:fillViewport="true"

and for WebView use android:layout_height="wrap_content"

Full Answer here