diff --git a/tests/Fixtures/TestBundle/Document/OptionalRequiredDummy.php b/tests/Fixtures/TestBundle/Document/OptionalRequiredDummy.php
new file mode 100644
index 00000000000..878bcdbb870
--- /dev/null
+++ b/tests/Fixtures/TestBundle/Document/OptionalRequiredDummy.php
@@ -0,0 +1,112 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\Document;
+
+use ApiPlatform\Metadata\ApiProperty;
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\GraphQl\Mutation;
+use ApiPlatform\Metadata\GraphQl\Query;
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
+use Symfony\Component\Serializer\Annotation\Groups;
+
+/**
+ * OptionalRequiredDummy. Used to test GraphQL Schema generation for nullable embedded relations.
+ */
+#[ApiResource(
+    graphQlOperations: [
+        new Query(name: 'item_query'),
+        new Mutation(name: 'update', normalizationContext: ['groups' => ['chicago', 'fakemanytomany']], denormalizationContext: ['groups' => ['friends']]),
+    ],
+)]
+#[ODM\Document]
+class OptionalRequiredDummy
+{
+    #[ApiProperty(writable: false)]
+    #[ODM\Id(strategy: 'INCREMENT', type: 'int')]
+    #[Groups(['chicago', 'friends'])]
+    private $id;
+
+    #[ODM\ReferenceOne(targetDocument: ThirdLevel::class, inversedBy: 'thirdLevel', nullable: true, storeAs: 'id')]
+    #[Groups(['barcelona', 'chicago', 'friends'])]
+    public ?ThirdLevel $thirdLevel = null;
+
+    #[ODM\ReferenceOne(targetDocument: ThirdLevel::class, inversedBy: 'thirdLevelRequired', nullable: true, storeAs: 'id')]
+    #[ApiProperty(required: true)]
+    #[Groups(['barcelona', 'chicago', 'friends'])]
+    public ThirdLevel $thirdLevelRequired;
+
+    #[ODM\ReferenceMany(targetDocument: RelatedToDummyFriend::class, mappedBy: 'relatedDummy')]
+    #[Groups(['fakemanytomany', 'friends'])]
+    public Collection|iterable $relatedToDummyFriend;
+
+    public function __construct()
+    {
+        $this->relatedToDummyFriend = new ArrayCollection();
+    }
+
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    public function setId($id): void
+    {
+        $this->id = $id;
+    }
+
+    public function getThirdLevel(): ?ThirdLevel
+    {
+        return $this->thirdLevel;
+    }
+
+    public function setThirdLevel(?ThirdLevel $thirdLevel = null): void
+    {
+        $this->thirdLevel = $thirdLevel;
+    }
+
+    public function getThirdLevelRequired(): ThirdLevel
+    {
+        return $this->thirdLevelRequired;
+    }
+
+    public function setThirdLevelRequired(ThirdLevel $thirdLevelRequired): void
+    {
+        $this->thirdLevelRequired = $thirdLevelRequired;
+    }
+
+    /**
+     * Get relatedToDummyFriend.
+     */
+    public function getRelatedToDummyFriend(): Collection|iterable
+    {
+        return $this->relatedToDummyFriend;
+    }
+
+    /**
+     * Set relatedToDummyFriend.
+     *
+     * @param RelatedToDummyFriend $relatedToDummyFriend the value to set
+     */
+    public function addRelatedToDummyFriend(RelatedToDummyFriend $relatedToDummyFriend): void
+    {
+        $this->relatedToDummyFriend->add($relatedToDummyFriend);
+    }
+
+    public function __toString(): string
+    {
+        return (string) $this->getId();
+    }
+}