Symfony5; cant access joined entity values

in my add hours controller i can see and access the variables in the collectionbut when i try to access them in the maincontroller, i only get an empty collection, see maincontroller

My ProjectHours entity

/** * Class ProjectHours * @ORM\Entity */class ProjectHours{    /**     * @ORM\Id     * @ORM\Column(type="integer")     * @ORM\GeneratedValue     */    private $id;    /**     * @ORM\Column(type="datetime")     */    private $timestamp_start;    /**     * @ORM\Column(type="datetime")     */    private $timestamp_end;    /**     * @ORM\ManyToOne(targetEntity="App\Entity\Project", inversedBy="project_hours")     * @ORM\JoinColumn(name="project_id", nullable=false, referencedColumnName="id", onDelete="CASCADE")     */    private $project;    /**     * @ORM\Column(type="dateinterval")     */    private $duration;    public function addProjectHours(ProjectHours $ph)    {        $this->project_hours[] = $ph;    }    /**     * @return Collection|ProjectHours[]     */    public function getProjectHours()    {        return $this->project_hours;    }

My Project entity

/** * Class Project * @ORM\Entity */class Project{    /**     * @ORM\Id     * @ORM\Column(type="integer")     * @ORM\GeneratedValue     */    private $id;    /**     * @ORM\Column(type="string")     */    private $name;    /**     * @ORM\ManyToOne(targetEntity="App\Entity\User", inversedBy="projects")     * @ORM\JoinColumn(name="user_id", nullable=false, referencedColumnName="id")     */    private $user;    /**     * @ORM\OneToMany(targetEntity="App\Entity\ProjectHours", mappedBy="project", cascade={"persist", "remove"})     */    private $project_hours;    public function addProjectHours(ProjectHours $ph)    {        $this->project_hours[] = $ph;    }    /**     * @return Collection|ProjectHours[]     */    public function getProjectHours()    {        return $this->project_hours;    }

My addHours controller

  #[Route('projects/{project}/new', name: 'app_newHours')]    public function index(Request $request, $project): Response    {        $em=$this->getDoctrine()->getManager();        $project = str_replace('%20', '', $project);        $hour_entry = new ProjectHours();        $hour_entry->setTimestampStart(new \DateTime('NOW'));        $hour_entry->setTimestampEnd(new \DateTime('NOW'));        $pj = $em->getRepository(Project::class)->findOneBy(array('name'=> $project));        $hour_entry->setProject($pj);        $form = $this->createForm(AddHoursClassType::class, $hour_entry );        $form->handleRequest($request);        if($form->isSubmitted() && $form->isValid())        {            $start = $hour_entry->getTimestampStart();            $end = $hour_entry->getTimestampEnd();            if($end > $start)            {                $interval = $start->diff($end);                $hour_entry->setDuration($interval);                $pj->addProjectHours($hour_entry);                //store to database                $em->persist($hour_entry);                $em->persist($pj);                $em->flush();                $this->addFlash('success', 'Hours added successfully!');            }            else            {                $this->addFlash('error', 'End time must be later than start time!');            }        }

and finally in my Maincontroller

 /**         * @Route("/projects", name="app_mainscreen")         */        public function Main()        {            $em = $this->getDoctrine()->getManager();            $user = $this->getUser();            $projects = $em->getRepository(Project::class)->findBy(array('user' => $user));            $hourlist = $this->getHourList($projects, $em);            dd($projects[0]->getProjectHours());            return $this->render('home.html.twig', ['projectlist' => $projects,'hourlist' => $hourlist            ]);        }

If anyone can help me it would be highly appreciated!