Doctrine不会获取尚未保留的已更改实体

Question

$objectRepository = $objectManager->getRepository(MyEntity::class);
$myEntity = $objectRepository->findOneBy(["name" => "AAA"]); // returns an object
$myEntity->changeName("BBB");
$myEntity = $objectRepository->findOneBy(["name" => "BBB"]); // doesn't return anything

I have some high level repository like UserRepository, ProductRepository, etc, with methods like ->add(User $user), or ->findByName($name), etc

And I use these Repositories across all my code to manipulate the entities, but since these entities are not persisted and flushed on EACH change, the Repositories cannot return changed entities because the doctrine's object repository cannot find the entities.

Any idea? Thanks