Embedded Youtube video widget disappears while the web page (created by Flutter for Web) is scrolled up or down

I managed to put an embedded Youtube video on a web page created using Flutter for Web. The problem is that this video widget disappears while the page is scrolled up or down, and reappears when the scrolling stops. The Chrome developer console shows this error remote.js:34 GET chrome-extension://invalid/ net::ERR_FAILED Firefox doesn't issue any error message but the flickering of the Youtube video happens there as well. It appears that the webpage continually fetches the Youtube video info again and again during the scroll. How do I fix this?

import 'package:flutter/material.dart';
import 'dart:html' as html;
import 'dart:ui' as ui;

void main() {
// ignore: undefined_prefixed_name
  ui.platformViewRegistry.registerViewFactory(
      'video',
      (int viewId) => html.IFrameElement()
        ..width = '640'
        ..height = '360'
        ..src = 'https://www.youtube-nocookie.com/embed/IyFZznAk69U'
        ..style.border = 'none');

  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
        builder: (BuildContext context, BoxConstraints viewportConstraints) {
      return SingleChildScrollView(
        child: ConstrainedBox(
          constraints: BoxConstraints(
            minHeight: viewportConstraints.maxHeight,
          ),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              Container(
                color: Colors.purple,
                child: Center(
                  child: Container(
                    height: 360,
                    width: 640,
                    color: Colors.green,
                    child: HtmlElementView(viewType: "video"),
                  ),
                ),
              ),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
              Text("test", textDirection: TextDirection.ltr),
            ],
          ),
        ),
      );
    });