TapGestureRecognizer onTap not triggering in webview_flutter

Question

When I run the example below, the instance of WebView (from webview_flutter plugin) never calls onTap, no matter which URL I'm on.

Because gestureRecognizers override the widget's gestures, I'd assume that onTap should be called whenever there is a tap anywhere in my webview - I'm I assuming something wrong here?

Future<void> main() async {
  runApp(WebViewBug());
}

class WebViewBug extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: WebView(
          initialUrl: 'https://google.com',
          javascriptMode: JavascriptMode.unrestricted,
          gestureRecognizers: {
            Factory<TapGestureRecognizer>(() => TapGestureRecognizer()
              ..onTap = () {
                print('didTap');
              }),
          },
        ),
      ),
    );
  }
}

Flutter version used is 2.5.2.