ReactOS freeze when unplugging serial debugger

reactos-bootcd-0.4.15-dev-4946-ge9a129c-x86-gcc-lin-dbg using VirtualBox 6.1.38

Run ReactOS with Putty connected

Once in the user session during shutdown sequence, close putty.

ReactOS gets frozen and unresponsive.

Unable to reconnect Putty then 

Unfortunately, since Putty is closed, I can't retrieve what would get logged

With reactos-bootcd-0.4.15-dev-5130-gc1c1279-x86-gcc-lin-dbg : occurence when exiting putty while ReactOS was idle (no shutdown sequence, no log activity)