Cannot disable fullscreen on Windows handheld in desktop mode / when Full Screen Experience is disabled

After receiving an update for LegionSpace on my Legion GO, I managed to get Full Screen Experience on it. But after disabling Full Screen Experience and entering desktop mode, Minecraft can no longer be windowed (can no longer exit fullscreen). Based of an assumption and a research, it was an issue that never appears when my handheld identified itself as a tablet (from when I bought it), but issue happens when it identifies as a gaming handheld (which happens after receiving LegionSpace 1.4.4.10), even when I disable Full Screen Experience completely from Windows Settings. And I need to revert the identification changed by the installer to workaorund the issue.

So if the Windows computer identifies itself as a gaming handheld, and Full Screen Experience is disabled (and is in desktop mode), Minecraft still always run in fullscreen, regardless if the fullscreen toggle is enabled or not.

Steps to reproduce (Windows gaming handheld (DeviceForm = 2e from Registry) only):

1. Make sure you left Full Screen Experience and is on the desktop.

2. Open Minecraft from the start menu (or desktop)

3. With Minecraft open, click Settings

4. Scroll to Video

5. Toggle Full Screen on and off

Expected results: The title bar should appear and the window should able to be resized when it’s not in full screen

Observed results: On Windows gaming handheld, turning full screen on or off does nothing, and the window can’t be resized even when fullscreen is “off”.

Workaround: make the gaming handheld identify as a tablet again (from https://learn.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-deployment-deviceform) (which is pretty risky, and will disallow Full Screen Experience until you undid the workaorund or Microsoft pushes an update that would allow that):

1. Exit Full Screen Experience and enter (Windows) desktop mode

2. Open Registry Editor from Start menu

3. Find HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\OEM.

4. Change the value of DeviceForm from 2e (hex, converts to 46) (Gaming handheld) to 2 (Tablet).

Note: You’ll need to have a PC that identifies as a gaming handheld, any other identifier may can’t be reproduced. Specs for reference: Lenovo Legion GO (AMD Z1 Extreme, 16GB RAM), LegionSpace 1.4.4.10