Can't understand mount point directories on Windows

Description

The following code:

<?php
var_dump(getcwd());
print_r(scandir("."));

Resulted in this output:

string(16) "R:\dreamflame.in"
PHP Warning:  scandir(.): The system cannot find the path specifi (code: 3) in Command line code on line 2

Warning: scandir(.): The system cannot find the path specifi (code: 3) in Command line code on line 2
PHP Warning:  scandir(.): Failed to open directory: No such file or directory in Command line code on line 2

Warning: scandir(.): Failed to open directory: No such file or directory in Command line code on line 2
PHP Warning:  scandir(): (errno 2): No such file or directory in Command line code on line 2

Warning: scandir(): (errno 2): No such file or directory in Command line code on line 2

But I expected directory listing instead

PHP Version

PHP 8.0.12

Operating System

Windows 11 build 22000

Comienza reproduciendo el ejemplo proporcionado de getcwd() y scandir(".") en Windows 11 con PHP 8.0.12, utilizando la ruta indicada R:\dreamflame.in. Compara el comportamiento del directorio actual y del listado del directorio con el de un directorio normal; se considera completado cuando scandir(".") muestra el contenido esperado sin advertencias.