Bug after PR 7600

[dmitryuk]

Hello
Related #7600

Describe the bug
After #7600 on my project I got a bug - createEntity called unexpectly while editing entries.

To Reproduce

class CrossSell
{
__construct(
        #[ORM\ManyToOne(targetEntity: CrossSellCampaign::class, inversedBy: 'crossSells')]
        #[ORM\JoinColumn(name: 'campaign_id', nullable: false)]
        private CrossSellCampaign $campaign,
)
{
$this->campaign->addCrossSell($this); // this needed to  consistent two-way relations (Symfony way)
}
}

class CrossSellCrudController extends AbstractCrudController
{
    public function createEntity(string $entityFqcn): CrossSell
    {
        $campaign = $this->em->getRepository(CrossSellCampaign::class)->findOneBy([]);
        assert($campaign instanceof CrossSellCampaign);
        $po = $this->em->getRepository(PriceOption::class)->findOneBy([]);
        assert($po instanceof PriceOption);

        $entity = new CrossSell(
            $campaign,
            $po,
            position: 0,
            placement: PlacementEnum::PROMO_BLOCK,
            actionType: ActionTypeEnum::ADD,
        );

        return $entity;
    }
}

After edit form opened a new random element is added to Campaign since createEntity is called unexpectedly.