running php vendor/bin/phpunit --group levels --list-tests on the PHPStan-src codebase returns the same list of tests, as when not using --group levels: php vendor/bin/phpunit --list-tests

I would expect --group levels to apply the same filtering as then running phpunit itself with --group levels.

$ vendor/bin/phpunit --version
PHPUnit 9.5.23 #StandWithUkraine

$ php -v
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

what I want to achieve: I want to use phpunit test filtering capabilities to separate the huge PHPStan test-suite into groups which I can run in parallel in GitHub Actions. running it in several parallel GitHub Action jobs has the benefit of utilizing more CPUs and therefore a faster feedback loop