Pluralizer class not autoloaded through Composer

[devkinetic]

I have tried to add this class to my project: composer require rachid/pluralizer:dev-main

Then use in a file:

use rachid\pluralizer\Pluralizer;

$text = Pluralizer::singularize($text);

This results in an error:

PHP Fatal error: Class 'rachid\pluralizer\Pluralizer' not found in ...

I then ran composer dump-autoload -o to further inspect. The reference in /vendor/composer/autoload_psr4.php exists.

'rachid/pluralizer\\' => array($vendorDir . '/rachid/pluralizer/src'),

When we look at /vendor/composer/autoload_classmap.php though, there is no reference to the Pluralizer class.