Fullscreen toggle button does not work as expected

Hi, I am building an application where whole screen should be video player.
**The problem** is that when I press full screen toggle button it exits full screen for a second or two and then it returns to fullscreen again.
Also the same thing happens when I launch the app in portrait mode and then press fullscreen button it remains in portrait mode, even though the button is in fullscreen state.

Here is my code, flutter doctor -v output and links to two videos with issues.

$ flutter doctor -v
[✓] Flutter (Channel stable, v1.12.13+hotfix.5, on Mac OS X 10.15.2 19C57, locale en-RS)
• Flutter version 1.12.13+hotfix.5 at /Users/lazarjovicic/flutter
• Framework revision 27321ebbad (6 weeks ago), 2019-12-10 18:15:01 -0800
• Engine revision 2994f7e1e6
• Dart version 2.7.0

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at /Users/lazarjovicic/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.3.1, Build version 11C504
• CocoaPods version 1.8.4

[✓] Android Studio (version 3.5)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 42.1.1
• Dart plugin version 191.8593
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] VS Code (version 1.41.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.7.1

[✓] Connected device (2 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 10 (API 29) (emulator)
• Android SDK built for x86 • emulator-5556 • android-x86 • Android 10 (API 29) (emulator)

• No issues found!

`import 'package:chewie/chewie.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:video_player/video_player.dart';

class VideoPlayerScreen extends StatefulWidget {
static String id = 'VideoPlayerScreen';

@override
_VideoPlayerScreenState createState() => _VideoPlayerScreenState();
}

class _VideoPlayerScreenState extends State {
VideoPlayerController _videoPlayerController = VideoPlayerController.network('https://www.radiantmediaplayer.com/media/bbb-360p.mp4');
ChewieController _chewieController;
Chewie _playerWidget;

@override
void initState() {
super.initState();
_chewieController = ChewieController(
videoPlayerController: _videoPlayerController,
aspectRatio: 3 / 2,
autoPlay: true,
looping: false,
fullScreenByDefault: true,
allowFullScreen: true,
deviceOrientationsAfterFullScreen: [DeviceOrientation.portraitUp],

);
_playerWidget = Chewie(
controller: _chewieController,
);
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: _playerWidget,
);
}

@override
void dispose() {
super.dispose();
_videoPlayerController.dispose();
_chewieController.dispose();
}
}`

Videos with issue https://vimeo.com/user107763391/review/386429256/a96061a733 and https://vimeo.com/user107763391/review/386429236/43f6785a78

Can you please help me to solve this issue? Thanks