freebsd stable - Apr 2021 - Updated to 13-STABLE in VirtualBox; on shutdown stuck after uhub[01] being detached

On Wed, 28 Apr 2021, parv/freebsd wrote:
> Solved the issue via ...
>
>  % sysctl hw.efi.poweroff=0
> ... after that shudown went on as expected. Got that from  ...
>
>
https://forums.freebsd.org/threads/freebsd-13-does-not-shut-down-my-laptop.79853/
Well, this also solved my problem described in a message to this list:

Date: Thu, 1 Apr 2021 18:58:01 +0300 (MSK)
From: Antony Uspensky <uspensky at x-art.ru>
To: freebsd-stable at freebsd.org
Subject: ACPI poweroff is not working on 13.0
Message-ID: <alpine.BSF.2.00.2104011807560.82747 at gw-old.x-art.ru>

I was wrong: it was EFI poweroff that did not work, not ACPI one.
I was too lazy to do a bisection, now I am OK.
Thank you for the tip!

Seems, this problem (non-working shutdown in EFI environment) is a POLA 
violation in 13.0. 
A.