I solved the Problem. If anyone has the same problem:
I changed the file Modules\QueuedTracking\Queue\Backend\Sentinel.php:
if (!class_exists('\Redis') && $this->timeout == 0) {
$this->timeout === 0.05;
}
to
if (!class_exists('\Redis') && $this->timeout == 0) {
$this->timeout = 0.05;
}
I think there are some more bugs with sentinel, because the CLI was not working without installing the php-redis extension and this souldnt be nessasary when reading the documentation when using sentinel.