No stack trace printed when PHPUnit is used from PHAR

[EdmondDantes]

$ tree
.
└── tests
└── Test.php

1 directory, 1 file

tests/Test.php

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

final class Test extends TestCase
{
    public function testOne(): void
    {
		$phpUnitRoot				= '';
		
		if(defined('__PHPUNIT_PHAR_ROOT__'))
		{
			$phpUnitRoot = __PHPUNIT_PHAR_ROOT__;
		}
		
        throw new \Exception('It\'s error should be displayed with backtrace: '.$phpUnitRoot);
    }
}

Run as phar:

php d:\server\PHP8\phpunit-9.5.0.phar ./tests

output:

D:\www\dev\phpunit_bug>php d:\server\PHP8\phpunit-9.5.0.phar ./tests
PHPUnit 9.5.0 by Sebastian Bergmann and contributors.

E                                                                   1 / 1 (100%)


Time: 00:00.003, Memory: 18.00 MB

There was 1 error:

1) Test::testOne
Exception: It's error should be displayed with backtrace: phar://phpunit-9.5.0.p
har

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

Expected:

php -f d:\server\PHP8\vendor\phpunit\phpunit\phpunit ./tests

D:\www\dev\phpunit_bug>php -f d:\server\PHP8\vendor\phpunit\phpunit\phpunit ./te
sts
PHPUnit 9.5.0 by Sebastian Bergmann and contributors.

E                                                                   1 / 1 (100%)


Time: 00:00.011, Memory: 4.00 MB

There was 1 error:

1) Test::testOne
Exception: It's error should be displayed with backtrace:

D:\www\dev\phpunit_bug\tests\Test.php:15

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

Explanation

phpunit/src/Util/Filter.php

Line 94 in 9bf7654

return $prefix === null &&

Issue:

PHPunit always hide any element of backtrace if launched from phar.

Reason:

Filter::shouldPrintFrame() always returns NULL if PHPUNIT_PHAR_ROOT defined.

Expected behavior:
Backtrace stack output