Symfony 6.1 - How to start a Command as a Process from Controller?

Question

I am currently working on a Symfony 6.1 project. I want to execute a Command as a Process from a Controller. However, I do not get it working. Everytime I execute the Command it fails with the Exit Code: (). The Command itself works like a charm if I run it via the cmd.

My current Code for executing the command as a Process:

        $cwd = substr(getcwd(), 0, strrpos(getcwd(), '/')).'/';
        $process = new Process(['php bin/console example:generate']); 
        $process->setWorkingDirectory($cwd);
        $process->start();

        if (!$process->isSuccessful()) {
            throw new ProcessFailedException($process);
        }

Other versions I have already tried out:

        $process = new Process(['php bin/console example:generate']);
        $process->start();

        $process = new Process(['php', 'bin/console', 'example:generate']); 
        $process->start();

        $process = new Process(['usr/bin/php', '/var/www/html/bin/console', 'example:generate']); 
        $process->start();

        $process = new Process(['usr/bin/php /var/www/html/bin/console example:generate']); 
        $process->start();

When I use the dd() Function to show the Process Object, I get the following Informations:

Symfony\Component\Process\Process {#2050
  -callback: null
  -hasCallback: false
  -commandline: array:1 [
    0 => "php bin/console example:generate"
  ]
  -cwd: "/var/www/html/"
  -env: []
  -input: null
  -starttime: null
  -lastOutputTime: null
  -timeout: 60.0
  -idleTimeout: null
  -exitcode: null
  -fallbackStatus: []
  -processInformation: null
  -outputDisabled: false
  -stdout: null
  -stderr: null
  -process: null
  -status: "ready"
  -incrementalOutputOffset: 0
  -incrementalErrorOutputOffset: 0
  -tty: false
  -pty: false
  -options: array:2 [
    "suppress_errors" => true
    "bypass_shell" => true
  ]
  -useFileHandles: false
  -processPipes: null
  -latestSignal: null
}

Can anyone tell me what I am doing wrong here?