PHAR of PHPUnit 9.3 is broken

[sebastianbergmann]

Test.php

<?php declare(strict_types=1);
use PHPUnit\Framework\TestCase;

final class Test extends TestCase
{
    public function testOne(): void
    {
        $this->assertCount(1, []);
    }
}

$ php phpunit-9.3.phar Test.php
PHPUnit 9.3.0 by Sebastian Bergmann and contributors.

E                                                                   1 / 1 (100%)

Time: 00:00, Memory: 16.00 MB

There was 1 error:

1) Test::testOne
Error: Class 'PHPUnit\count' not found

/home/sb/Test.php:8

ERRORS!
Tests: 1, Assertions: 0, Errors: 1.

[sebastianbergmann]

Looks like this is related to #4382.