EasyAdminBundle: OneToMany is not working in update ie) cascade={persist}

I have two entities called Project(OneToMany) and Project Members(ManyToOne). I want to add my project members in project entity itself. Removing project member is working with orphanRemoval=‘true’ But Adding project member is not working with cascade={“persist”}. Need some help to complete the project.

EasyAdmin version : 1.17.9

Project.php

class Project
{

    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255)
     */
    private $name;

    /**
     * @var bool
     *
     * @ORM\Column(name="status", type="boolean")
     */
    private $status;

    /**
     * @ORM\OneToMany(targetEntity="ProjectMember", mappedBy="project", cascade={"persist"})
     */
    private $projectMembers;

    /**
     * @ORM\OneToMany(targetEntity="TimeEntry", mappedBy="project")
     */
    private $timeEntries;

    /**
     * Get id
     *
     * @return int
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     *
     * @return Project
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set status
     *
     * @param boolean $status
     *
     * @return Project
     */
    public function setStatus($status)
    {
        $this->status = $status;

        return $this;
    }

    /**
     * Get status
     *
     * @return bool
     */
    public function getStatus()
    {
        return $this->status;
    }

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->projectMembers = new \Doctrine\Common\Collections\ArrayCollection();
        $this->timeEntries = new \Doctrine\Common\Collections\ArrayCollection();
    }

    /**
     * Add projectMember
     *
     * @param \App\Entity\ProjectMember $projectMember
     *
     * @return Project
     */
    public function addProjectMember(\App\Entity\ProjectMember $projectMember)
    {
        $this->projectMembers[] = $projectMember;

        return $this;
    }

    /**
     * Remove projectMember
     *
     * @param \App\Entity\ProjectMember $projectMember
     */
    public function removeProjectMember(\App\Entity\ProjectMember $projectMember)
    {
        $this->projectMembers->removeElement($projectMember);
    }

    /**
     * Get projectMembers
     *
     * @return \Doctrine\Common\Collections\Collection
     */
    public function getProjectMembers()
    {
        return $this->projectMembers;
    }

    /**
     * Add timeEntry
     *
     * @param \App\Entity\TimeEntry $timeEntry
     *
     * @return Project
     */
    public function addTimeEntry(\App\Entity\TimeEntry $timeEntry)
    {
        $this->timeEntries[] = $timeEntry;

        return $this;
    }

    /**
     * Remove timeEntry
     *
     * @param \App\Entity\TimeEntry $timeEntry
     */
    public function removeTimeEntry(\App\Entity\TimeEntry $timeEntry)
    {
        $this->timeEntries->removeElement($timeEntry);
    }

    /**
     * Get timeEntries
     *
     * @return \Doctrine\Common\Collections\Collection
     */
    public function getTimeEntries()
    {
        return $this->timeEntries;
    }

    public function __toString()
    {
        return (string) $this->name;
    }

}

Project Member.php

class ProjectMember
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @var int
     *
     * @ORM\Column(name="project_id", type="integer")
     */
    private $projectId;

    /**
     * @var int
     *
     * @ORM\Column(name="user_id", type="integer")
     */
    private $userId;

    /**
     * @ORM\ManyToOne(targetEntity="Project", inversedBy="projectMembers")
     * @ORM\JoinColumn(name="project_id", referencedColumnName="id")
     */
    private $project;

    /**
     * @ORM\ManyToOne(targetEntity="User", inversedBy="projects")
     * @ORM\JoinColumn(name="user_id", referencedColumnName="id")
     */
    private $user;
    
    /**
     * Get id
     *
     * @return int
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set projectId
     *
     * @param integer $projectId
     *
     * @return ProjectMember
     */
    public function setProjectId($projectId)
    {
        $this->projectId = $projectId;

        return $this;
    }

    /**
     * Get projectId
     *
     * @return int
     */
    public function getProjectId()
    {
        return $this->projectId;
    }

    /**
     * Set userId
     *
     * @param integer $userId
     *
     * @return ProjectMember
     */
    public function setUserId($userId)
    {
        $this->userId = $userId;

        return $this;
    }

    /**
     * Get userId
     *
     * @return int
     */
    public function getUserId()
    {
        return $this->userId;
    }


    /**
     * Set project
     *
     * @param \App\Entity\Project $project
     *
     * @return ProjectMember
     */
    public function setProject(\App\Entity\Project $project = null)
    {
        $this->project = $project;

        return $this;
    }

    /**
     * Get project
     *
     * @return \App\Entity\Project
     */
    public function getProject()
    {
        return $this->project;
    }

    /**
     * Set user
     *
     * @param \App\Entity\User $user
     *
     * @return ProjectMember
     */
    public function setUser(\App\Entity\User $user = null)
    {
        $this->user = $user;

        return $this;
    }

    /**
     * Get user
     *
     * @return \App\Entity\User
     */
    public function getUser()
    {
        return $this->user;
    }
    
    public function __toString()
    {
        return (string) $this->user;
    }
}

Help me out to complete the issue