Originally reproduced with 27.2. I now upgraded to 28.1. Pretty sure it is the same with master.

In GNU Emacs 28.1.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.33, cairo version 1.16.0)
of 2022-04-27 built on gonzo
Repository revision: b511f5c05ced05fc7d1e403002bc5ba782879cba
Repository branch: emacs-28
Windowing system distributor 'The X.Org Foundation', version 11.0.12014000
System Description: Debian GNU/Linux bookworm/sid

Configured using:
'configure --with-x-toolkit=gtk2'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND
THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK2 ZLIB

Important settings:
value of $LC_MONETARY: de_AT.UTF-8
value of $LC_NUMERIC: ru_RU.UTF-8
value of $LC_TIME: de_DE.UTF-8
value of $LANG: en_CA.UTF-8
locale-coding-system: utf-8-unix

On Wed, 27 Apr 2022 at 04:27, Eli Zaretskii <eliz@gnu.org> wrote:

> From: Paul Pogonyshev <pogonyshev@gmail.com>
> Date: Wed, 27 Apr 2022 00:16:42 +0200
>
> I'm not absolutely sure if it is a bug or a "feature", but it is
> extremely confusing.

Thanks, but please tell in what version of Emacs is this, and
preferably show the information about your build that's collected by
"M-x report-emacs-bug".