Can not use shortcut key like Windows Key via Bastion.
I pressed Windows key and I found that operation forcused my laptop PC. I confirmed same behavior when I pressed "Alt + Tab" to change Task Window.
I found same case in stackover flow.
I hope you to add this feature.
And when pressing Alt-F4 in bastion it closes the browser not a process inside the bastion/vm.
Also pressing ctrl-w closes the browser-tab on host, not a tab inside the client.