Prevent creation of new MANAGED entity instance by reloading REMOVED entity from database

src/UnitOfWork.php

@@ -1292,6 +1292,8 @@ private function executeDeletions(): void
         $eventsToDispatch = [];
 
         foreach ($entities as $entity) {
+            $this->removeFromIdentityMap($entity);
+
             $oid       = spl_object_id($entity);
             $class     = $this->em->getClassMetadata(get_class($entity));
             $persister = $this->getEntityPersister($class->name);
@@ -1667,8 +1669,6 @@ public function scheduleForDelete($entity)
             return;
         }
 
-        $this->removeFromIdentityMap($entity);
-
         unset($this->entityUpdates[$oid]);
 
         if (! isset($this->entityDeletions[$oid])) {

tests/Tests/ORM/Functional/Ticket/GH6123Test.php

@@ -0,0 +1,80 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\DBAL\Types\Types;
+use Doctrine\ORM\Mapping as ORM;
+use Doctrine\ORM\Mapping\Column;
+use Doctrine\ORM\UnitOfWork;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+class GH6123Test extends OrmFunctionalTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->createSchemaForModels(
+            GH6123Entity::class,
+        );
+    }
+
+    public function testLoadingRemovedEntityFromDatabaseDoesNotCreateNewManagedEntityInstance(): void
+    {
+        $entity = new GH6123Entity();
+        $this->_em->persist($entity);
+        $this->_em->flush();
+
+        self::assertSame(UnitOfWork::STATE_MANAGED, $this->_em->getUnitOfWork()->getEntityState($entity));
+        self::assertFalse($this->_em->getUnitOfWork()->isScheduledForDelete($entity));
+
+        $this->_em->remove($entity);
+
+        $freshEntity = $this->loadEntityFromDatabase($entity->id);
+        self::assertSame($entity, $freshEntity);
+
+        self::assertSame(UnitOfWork::STATE_REMOVED, $this->_em->getUnitOfWork()->getEntityState($freshEntity));
+        self::assertTrue($this->_em->getUnitOfWork()->isScheduledForDelete($freshEntity));
+    }
+
+    public function testRemovedEntityCanBePersistedAgain(): void
+    {
+        $entity = new GH6123Entity();
+        $this->_em->persist($entity);
+        $this->_em->flush();
+
+        $this->_em->remove($entity);
+        self::assertSame(UnitOfWork::STATE_REMOVED, $this->_em->getUnitOfWork()->getEntityState($entity));
+        self::assertTrue($this->_em->getUnitOfWork()->isScheduledForDelete($entity));
+
+        $this->loadEntityFromDatabase($entity->id);
+
+        $this->_em->persist($entity);
+        self::assertSame(UnitOfWork::STATE_MANAGED, $this->_em->getUnitOfWork()->getEntityState($entity));
+        self::assertFalse($this->_em->getUnitOfWork()->isScheduledForDelete($entity));
+
+        $this->_em->flush();
+    }
+
+    private function loadEntityFromDatabase(int $id): GH6123Entity|null
+    {
+        return $this->_em->createQueryBuilder()
+            ->select('e')
+            ->from(GH6123Entity::class, 'e')
+            ->where('e.id = :id')
+            ->setParameter('id', $id)
+            ->getQuery()
+            ->getOneOrNullResult();
+    }
+}
+
+#[ORM\Entity]
+class GH6123Entity
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[Column(type: Types::INTEGER, nullable: false)]
+    public int $id;
+}

tests/Tests/ORM/UnitOfWorkTest.php

@@ -413,12 +413,18 @@ public function testRemovedAndRePersistedEntitiesAreInTheIdentityMapAndAreNotGar
         $entity->id = 123;
 
         $this->_unitOfWork->registerManaged($entity, ['id' => 123], []);
+        self::assertSame(UnitOfWork::STATE_MANAGED, $this->_unitOfWork->getEntityState($entity));
+        self::assertFalse($this->_unitOfWork->isScheduledForDelete($entity));
         self::assertTrue($this->_unitOfWork->isInIdentityMap($entity));
 
         $this->_unitOfWork->remove($entity);
-        self::assertFalse($this->_unitOfWork->isInIdentityMap($entity));
+        self::assertSame(UnitOfWork::STATE_REMOVED, $this->_unitOfWork->getEntityState($entity));
+        self::assertTrue($this->_unitOfWork->isScheduledForDelete($entity));
+        self::assertTrue($this->_unitOfWork->isInIdentityMap($entity));
 
         $this->_unitOfWork->persist($entity);
+        self::assertSame(UnitOfWork::STATE_MANAGED, $this->_unitOfWork->getEntityState($entity));
+        self::assertFalse($this->_unitOfWork->isScheduledForDelete($entity));
         self::assertTrue($this->_unitOfWork->isInIdentityMap($entity));
     }