diff --git a/tests/Fixture/Model/GenericModel.php b/tests/Fixture/Model/GenericModel.php
index 9a288f3fc..d40b6ae7b 100644
--- a/tests/Fixture/Model/GenericModel.php
+++ b/tests/Fixture/Model/GenericModel.php
@@ -11,6 +11,8 @@
 
 namespace Zenstruck\Foundry\Tests\Fixture\Model;
 
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ODM\MongoDB\Mapping\Annotations as MongoDB;
 use Doctrine\ORM\Mapping as ORM;
 
@@ -37,9 +39,20 @@ abstract class GenericModel
     #[MongoDB\Field(type: 'date_immutable', nullable: true)]
     private ?\DateTimeImmutable $date = null;
 
+
+    #[ORM\OneToMany(targetEntity: GenericModelCollectionItem::class, mappedBy: 'genericModel', cascade: ['persist'])]
+    #[MongoDB\Field()]
+    private Collection $collection;
+
+    /** @var list<string> */
+    #[ORM\Column()]
+    #[MongoDB\Field()]
+    private array $otherCollection = [];
+
     public function __construct(string $prop1)
     {
         $this->prop1 = $prop1;
+        $this->collection = new ArrayCollection();
     }
 
     public function getProp1(): string
@@ -61,4 +74,25 @@ public function setDate(?\DateTimeImmutable $date): void
     {
         $this->date = $date;
     }
+
+    public function getCollection(): Collection
+    {
+        return $this->collection;
+    }
+
+    public function addElementToCollection(GenericModelCollectionItem $element): void
+    {
+        $element->setGenericModel($this);
+        $this->collection->add($element);
+    }
+
+    public function getOtherCollection(): array
+    {
+        return $this->otherCollection;
+    }
+
+    public function addElementToOtherCollection(string $element): void
+    {
+        $this->otherCollection[] = $element;
+    }
 }
diff --git a/tests/Integration/Persistence/GenericProxyFactoryTestCase.php b/tests/Integration/Persistence/GenericProxyFactoryTestCase.php
index 014ed2a0f..c88ed8ad1 100644
--- a/tests/Integration/Persistence/GenericProxyFactoryTestCase.php
+++ b/tests/Integration/Persistence/GenericProxyFactoryTestCase.php
@@ -20,6 +20,7 @@
 use Zenstruck\Foundry\Tests\Fixture\Model\Embeddable;
 use Zenstruck\Foundry\Tests\Fixture\Model\GenericModel;
 
+use Zenstruck\Foundry\Tests\Fixture\Model\GenericModelCollectionItem;
 use function Zenstruck\Foundry\factory;
 
 /**
@@ -282,6 +283,35 @@ public function can_use_after_persist_with_attributes(): void
         $this->assertSame($value, $object->getProp1());
     }
 
+    /**
+     * @test
+     */
+    public function real_method_always_return_same_instance(): void
+    {
+        $object = static::factory()->create();
+
+        $this->assertSame($object->_real(), $object->_real());
+
+        $ci1 = new GenericModelCollectionItem('foo');
+        $ci2 = new GenericModelCollectionItem('bar');
+
+        $object->_real()->addElementToCollection($ci1);
+        $object->_real()->addElementToCollection($ci2);
+
+        $object->_real()->addElementToOtherCollection('foo2');
+        $object->_real()->addElementToOtherCollection('bar2');
+
+        $object->_save();
+
+        $this->assertSame(2, $object->getCollection()->count());
+        $this->assertSame(2, $object->_real()->getCollection()->count());
+
+        $this->assertSame(['foo2', 'bar2'], $object->getOtherCollection());
+        $this->assertSame(['foo2', 'bar2'], $object->_real()->getOtherCollection());
+
+        $this->assertSame($object->_real(), $object->_real());
+    }
+
     /**
      * @test
      */