pcntl_waitpid() bug on 7.3 + ext-grpc macos

pcntl_waitpid.php

<?php

declare(strict_types=1);

$childProcs = [];

for ($batch = 0; $batch < 1; $batch++) {
    $pid = pcntl_fork();
    if ($pid === -1) {
        throw new RuntimeException('Failed to create child process');
    }

    if ($pid !== 0) {
        $childProcs[] = [
            'pid' => $pid,
        ];
    } else {
        echo 'Exiting child';
        echo PHP_EOL;
        exit(0);
    }
}

while (count($childProcs) > 0) {
    foreach ($childProcs as $key => $procData) {
        $res = pcntl_waitpid($procData['pid'], $status, WNOHANG);
        if ($res === $procData['pid']) {
            unset($childProcs[$key]);
            echo 'unset child ' . $key;
            echo PHP_EOL;
        }
    }
}