Windows: Duplicate "Unable to load dynamic library" warning

Description

The following code:

$ php -v 
PHP Warning:  PHP Startup: Unable to load dynamic library 'ftp' (tried: ext\ftp (Das angegebene Modul wurde nicht gefunden), ext\php_ftp.dll (Falscher Parameter)) in Unknown on line 0

Warning: PHP Startup: Unable to load dynamic library 'ftp' (tried: ext\ftp (Das angegebene Modul wurde nicht gefunden), ext\php_ftp.dll (Falscher Parameter)) in Unknown on line 0
PHP 8.2.12 (cli) (built: Oct 24 2023 21:15:35) (NTS Visual C++ 2019 x64)
Copyright (c) The PHP Group
Zend Engine v4.2.12, Copyright (c) Zend Technologies

$ php -v 2>/dev/null

Warning: PHP Startup: Unable to load dynamic library 'ftp' (tried: ext\ftp (Das angegebene Modul wurde nicht gefunden), ext\php_ftp.dll (Falscher Parameter)) in Unknown on line 0
PHP 8.2.12 (cli) (built: Oct 24 2023 21:15:35) (NTS Visual C++ 2019 x64)
Copyright (c) The PHP Group
Zend Engine v4.2.12, Copyright (c) Zend Technologies

But I expected this output instead:

-> no warning in the output when stderr is redirected
-> one warning is propery redirected but it seems the very same warning is emitted a second time on stdout?

PHP Version

8.2.12

Operating System

windows11

Reproduce the behavior on Windows 11 with php -v and php -v 2>/dev/null, comparing the duplicate startup warning and redirected output. Trace the CLI startup and warning-output path implicated by the example; done means the warning is emitted once and follows stderr redirection as expected.