Reproduce exception on same class relation

tests/Doctrine/Tests/Models/GH10348/GH10348ChildEntity.php

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+<?php
+
+namespace Doctrine\Tests\Models\GH10348;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @ORM\Entity
+ * @ORM\Table(name="gh10348_child_entities")
+ */
+#[ORM\Entity]
+#[ORM\Table(name: 'gh10348_child_entities')]
+class GH10348ChildEntity
+{
+    /**
+     * @ORM\Id
+     * @ORM\Column(type="integer")
+     * @ORM\GeneratedValue
+     */
+    #[ORM\Id]
+    #[ORM\Column(type: 'integer')]
+    #[ORM\GeneratedValue]
+    private ?int $id = null;
+
+    /**
+     * @ORM\ManyToOne(targetEntity="GH10348ParentEntity", inversedBy="children")
+     */
+    #[ORM\ManyToOne(targetEntity: GH10348ParentEntity::class, inversedBy: 'children')]
+    private ?GH10348ParentEntity $parent = null;
+
+    /**
+     * @ORM\ManyToOne(targetEntity="GH10348ChildEntity", cascade={"remove"})
+     */
+    #[ORM\ManyToOne(targetEntity: GH10348ChildEntity::class, cascade: ['remove'])]
+    private ?GH10348ChildEntity $origin = null;
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function setId(?int $id): void
+    {
+        $this->id = $id;
+    }
+
+    public function getParent(): ?GH10348ParentEntity
+    {
+        return $this->parent;
+    }
+
+    public function setParent(?GH10348ParentEntity $parent): void
+    {
+        $this->parent = $parent;
+    }
+
+    public function getOrigin(): ?GH10348ChildEntity
+    {
+        return $this->origin;
+    }
+
+    public function setOrigin(?GH10348ChildEntity $origin): void
+    {
+        $this->origin = $origin;
+    }
+}

tests/Doctrine/Tests/Models/GH10348/GH10348ParentEntity.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Doctrine\Tests\Models\GH10348;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @ORM\Entity
+ * @ORM\Table(name="gh10348_parent_entities")
+ */
+#[ORM\Entity]
+#[ORM\Table(name: 'gh10348_parent_entities')]
+class GH10348ParentEntity
+{
+    /**
+     * @ORM\Id
+     * @ORM\Column(type="integer")
+     * @ORM\GeneratedValue
+     */
+    #[ORM\Id]
+    #[ORM\Column(type: 'integer')]
+    #[ORM\GeneratedValue]
+    private ?int $id = null;
+
+    /**
+     * @ORM\OneToMany(targetEntity="GH10348ChildEntity", mappedBy="parent", cascade={"persist", "remove"})
+     */
+    #[ORM\OneToMany(targetEntity: GH10348ChildEntity::class, mappedBy: 'parent', cascade: ['persist', 'remove'])]
+    private Collection $children;
+
+    public function __construct()
+    {
+        $this->children = new ArrayCollection();
+    }
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function addChild(GH10348ChildEntity $childEntity): self
+    {
+        $childEntity->setParent($this);
+        $this->children->add($childEntity);
+
+        return $this;
+    }
+}

tests/Doctrine/Tests/ORM/Functional/Ticket/GH10348Test.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\ORM\Mapping\Driver\AttributeDriver;
+use Doctrine\ORM\Tools\SchemaTool;
+use Doctrine\Tests\Models\GH10348\GH10348ChildEntity;
+use Doctrine\Tests\Models\GH10348\GH10348ParentEntity;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+final class GH10348Test extends OrmFunctionalTestCase
+{
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        $this->setUpEntitySchema([
+            GH10348ChildEntity::class,
+            GH10348ParentEntity::class,
+        ]);
+    }
+
+    public function testCanRemoveParentWithChildRelatesToOwnEntity(): void
+    {
+        $child1 = new GH10348ChildEntity();
+        $child2 = new GH10348ChildEntity();
+        $child2->setOrigin($child1);
+
+        $parent = new GH10348ParentEntity();
+        $parent->addChild($child1)->addChild($child2);
+
+        $this->_em->persist($parent);
+        $this->_em->flush();
+
+        $parent = $this->_em->find(GH10348ParentEntity::class, $parent->getId());
+
+        $this->_em->remove($parent);
+
+        $this->assertNull($this->_em->flush());
+    }
+}