Android : webview shouldOverrideUrlLoading doesn't work as expected?

I have a webview that loads a real URL something like https://example.com

I would like to open some links according to a pattern in a second webview.

I have the following code:

public boolean shouldOverrideUrlLoading(WebView view, String url) {
    // Handle external url
    boolean openInNew = manageUrl (url);
    Log.i("openurl", url + " : " + openInNew);
    if (openInNew) {
        this.callBack.openWebView2 (url);
        return true;
    } else {        
        return false;
    }
}

The second webview shows correctly the external url I want to load.

The problem I found is about what happens with the original webview, it is also redirected to an empty blank page (with a loading icon).

Is possible to keep the first webview in the original page? I thought that with shouldOverrideUrlLoading should be enough.

Maybe I forgot something, any help would be appreciate.

Thanks a lot.