Symfony 6 populate Dropdown with Dynamic entities

Question

I have a CreditCard entity, on form screen there is a dropdown with user's Bank entities and I want to fill BankAccount dropdown according to selected bank dynamically, I have tried couple solutions from SO and added an event listener to my form but when I change the Bank dropdown I get "Integrity constraint violation: kart_adi (credit card name field on entity) cannot be null. I am using Symfony 6 with php 8.1.2

KrediKarti.php:

class KrediKarti
{
#[ORM\Id]
#[ORM\GeneratedValue]
#[ORM\Column(type: 'integer')]
private $id;

#[ORM\ManyToOne(targetEntity: Banka::class)]
#[ORM\JoinColumn(nullable: false)]
private $banka;

#[ORM\ManyToOne(targetEntity: BankaHesap::class, inversedBy: 'krediKartlari')]
#[ORM\JoinColumn(nullable: false)]
private $hesap;

#[ORM\Column(type: 'string', length: 255)]
private $kart_adi;

#[ORM\Column(type: 'string', length: 255)]
private $kart_no;

#[ORM\Column(type: 'integer')]
private $hesap_kesim_gunu;

#[ORM\Column(type: 'string', length: 255, nullable: true)]
private $aciklama;

#[ORM\Column(type: 'float')]
private $borc;

#[ORM\Column(type: 'float')]
private $alacak;

#[ORM\Column(type: 'datetime_immutable')]
private $created_at;

public function getId(): ?int
{
    return $this->id;
}

public function getBanka(): ?Banka
{
    return $this->banka;
}

public function setBanka(?Banka $banka): self
{
    $this->banka = $banka;

    return $this;
}

public function getHesap(): ?BankaHesap
{
    return $this->hesap;
}

public function setHesap(?BankaHesap $hesap): self
{
    $this->hesap = $hesap;

    return $this;
}

public function getKartAdi(): ?string
{
    return $this->kart_adi;
}

public function setKartAdi(string $kart_adi): self
{
    $this->kart_adi = $kart_adi;

    return $this;
}

public function getKartNo(): ?string
{
    return $this->kart_no;
}

public function setKartNo(string $kart_no): self
{
    $this->kart_no = $kart_no;

    return $this;
}

public function getHesapKesimGunu(): ?int
{
    return $this->hesap_kesim_gunu;
}

public function setHesapKesimGunu(int $hesap_kesim_gunu): self
{
    $this->hesap_kesim_gunu = $hesap_kesim_gunu;

    return $this;
}

public function getAciklama(): ?string
{
    return $this->aciklama;
}

public function setAciklama(?string $aciklama): self
{
    $this->aciklama = $aciklama;

    return $this;
}

public function getBorc(): ?float
{
    return $this->borc;
}

public function setBorc(float $borc): self
{
    $this->borc = $borc;

    return $this;
}

public function getAlacak(): ?float
{
    return $this->alacak;
}

public function setAlacak(float $alacak): self
{
    $this->alacak = $alacak;

    return $this;
}

public function getCreatedAt(): ?\DateTimeImmutable
{
    return $this->created_at;
}

public function setCreatedAt(\DateTimeImmutable $created_at): self
{
    $this->created_at = $created_at;

    return $this;
}
}

KrediKartiType.php:

$builder
        ->add('kart_adi',TextType::class,['label' => 'Kart Adı','required' => false, 'attr' =>['class' => 'form-control', 'placeholder' => 'Kart Adı']])
        ->add('kart_no',TextType::class,['label' => 'Kart No','required' => false, 'attr' =>['class' => 'form-control', 'placeholder' => 'Kart No']])
        ->add('hesap_kesim_gunu', NumberType::class, [
            'label' => 'Hesap Kesim Tarihi', 'attr' =>['class' => 'form-control', 'placeholder' => 'Hesap Kesim Günü']
        ])
        ->add('aciklama',TextType::class,['label' => 'Açıklama','required' => false, 'attr' =>['class' => 'form-control', 'placeholder' => 'Açıklama']])
        ->add('borc', NumberType::class,
            [
                'label' => 'Borç', 'attr' =>['class' => 'form-control', 'placeholder' => "Borç",'value' => '0.00','style' => 'text-align: right']
            ])
        ->add('alacak', NumberType::class,
            [
                'label' => 'Alacak', 'attr' =>['class' => 'form-control', 'placeholder' => "Alacak",'value' => '0.00','style' => 'text-align: right']
            ])
        ->add('banka',  EntityType::class, array(
            'class' => Banka::class,
            'choice_label'=> 'adi',
            'placeholder' => 'Lütfen bankanızı seçiniz',
            'attr' =>['class' => 'form-control']
        ))

    ;

    $formModifier = function (FormInterface $form, Banka $banka = null) {
        $banka_hesap = null === $banka ? [] : $banka->getBankaHesaplari();

        $form->add('hesap', EntityType::class, [
            'class' => BankaHesap::class,
            'placeholder' => '',
            'choices' => $banka_hesap,
        ]);
    };

    $builder->addEventListener(
        FormEvents::PRE_SET_DATA,
        function (FormEvent $event) use ($formModifier) {
            $data = $event->getData();

            $formModifier($event->getForm(), $data->getBanka());
        }
    );

    $builder->get('banka')->addEventListener(
        FormEvents::POST_SUBMIT,
        function (FormEvent $event) use ($formModifier) {
            $banka = $event->getForm()->getData();

            $formModifier($event->getForm()->getParent(), $banka);
        }
    );

new.html.twig:

<script>
var $banka = $('#kredi_karti_banka');
var $token = $('#kredi_karti__token');
$banka.change(function() {
    var $form = $(this).closest('form');
    var data = {};
    data[$banka.attr('name')] = $banka.val();
    data[$token.attr('name')] = $token.val();
    $.ajax({
    url : $form.attr('action'),
    type: $form.attr('method'),
    data : data,
    complete: function(html) {
    // Replace current position field ...
    $('#kredi_karti_hesap').replaceWith(
    // ... with the returned one from the AJAX response.
    $(html.responseText).find('#meetup_position')
    );
    // Position field now displays the appropriate positions.
    }
    });
});
</script>

I simply want to fetch bank accounts based on the selected bank on bank change.