diff --git a/tests/Tests/ORM/Functional/Ticket/GH11149/EagerProduct.php b/tests/Tests/ORM/Functional/Ticket/GH11149/EagerProduct.php
new file mode 100644
index 00000000000..dfbdfe2b503
--- /dev/null
+++ b/tests/Tests/ORM/Functional/Ticket/GH11149/EagerProduct.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity]
+#[ORM\Table('gh11149_eager_product')]
+class EagerProduct
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'integer')]
+    public int $id;
+
+    #[ORM\OneToMany(
+        targetEntity: EagerProductTranslation::class,
+        mappedBy: 'product',
+        fetch: 'EAGER',
+        indexBy: 'locale_code',
+    )]
+    public Collection $translations;
+
+    public function __construct(int $id)
+    {
+        $this->id           = $id;
+        $this->translations = new ArrayCollection();
+    }
+}
diff --git a/tests/Tests/ORM/Functional/Ticket/GH11149/EagerProductTranslation.php b/tests/Tests/ORM/Functional/Ticket/GH11149/EagerProductTranslation.php
new file mode 100644
index 00000000000..12a524ce702
--- /dev/null
+++ b/tests/Tests/ORM/Functional/Ticket/GH11149/EagerProductTranslation.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity]
+#[ORM\Table('gh11149_eager_product_translation')]
+class EagerProductTranslation
+{
+    #[ORM\Id]
+    #[ORM\ManyToOne(targetEntity: EagerProduct::class, inversedBy: 'translations')]
+    #[ORM\JoinColumn(nullable: false)]
+    public EagerProduct $product;
+
+    #[ORM\Id]
+    #[ORM\ManyToOne(targetEntity: Locale::class)]
+    #[ORM\JoinColumn(name: 'locale_code', referencedColumnName: 'code', nullable: false)]
+    public Locale $locale;
+
+    public function __construct(EagerProduct $product, Locale $locale)
+    {
+        $this->product = $product;
+        $this->locale  = $locale;
+    }
+}
diff --git a/tests/Tests/ORM/Functional/Ticket/GH11149/GH11149Test.php b/tests/Tests/ORM/Functional/Ticket/GH11149/GH11149Test.php
new file mode 100644
index 00000000000..5fe081ba9f8
--- /dev/null
+++ b/tests/Tests/ORM/Functional/Ticket/GH11149/GH11149Test.php
@@ -0,0 +1,108 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\ORM\PersistentCollection;
+use Doctrine\Persistence\Proxy;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+class GH11149Test extends OrmFunctionalTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->setUpEntitySchema([
+            Locale::class,
+            EagerProduct::class,
+            EagerProductTranslation::class,
+            RegularProduct::class,
+            RegularProductTranslation::class,
+        ]);
+    }
+
+    public function testFetchDefaultModeWithIndexBy(): void
+    {
+        // Load entities into database
+        $this->_em->persist($product = new RegularProduct(11149));
+        $this->_em->persist($locale = new Locale('de_DE'));
+        $this->_em->persist(new RegularProductTranslation($product, $locale));
+        $this->_em->flush();
+        $this->_em->clear();
+
+        // Fetch entity from database
+        $product = $this->_em->find(RegularProduct::class, 11149);
+
+        // Assert associated entity is not loaded eagerly
+        static::assertInstanceOf(RegularProduct::class, $product);
+        static::assertInstanceOf(PersistentCollection::class, $product->translations);
+        static::assertFalse($product->translations->isInitialized());
+        static::assertCount(1, $product->translations);
+
+        // Assert associated entity is indexed by given property
+        $translation = $product->translations->get('de_DE');
+        static::assertInstanceOf(RegularProductTranslation::class, $translation);
+        static::assertNotInstanceOf(Proxy::class, $translation);
+    }
+
+    public function testFetchDefaultModeThroughEagerRepositoryCall(): void
+    {
+        // Load entities into database
+        $this->_em->persist($product = new RegularProduct(11185));
+        $this->_em->persist($locale = new Locale('nl_NL'));
+        $this->_em->persist(new RegularProductTranslation($product, $locale));
+        $this->_em->flush();
+        $this->_em->clear();
+
+        // Fetch entity from database
+        $queryBuilder = $this->_em->createQueryBuilder();
+
+        $queryBuilder
+            ->select('product', 'translations')
+            ->from(RegularProduct::class, 'product')
+            ->leftJoin('product.translations', 'translations')
+            ->where($queryBuilder->expr()->eq('product.id', ':product_id'));
+
+        $product = $queryBuilder
+            ->getQuery()
+            ->setParameter('product_id', 11185)
+            ->getSingleResult();
+
+        // Assert associated entity is loaded eagerly
+        static::assertInstanceOf(RegularProduct::class, $product);
+        static::assertInstanceOf(PersistentCollection::class, $product->translations);
+        static::assertTrue($product->translations->isInitialized());
+        static::assertCount(1, $product->translations);
+
+        // Assert associated entity is indexed by given property
+        $translation = $product->translations->get('nl_NL');
+        static::assertInstanceOf(RegularProductTranslation::class, $translation);
+        static::assertNotInstanceOf(Proxy::class, $translation);
+    }
+
+    public function testFetchEagerModeWithIndexBy(): void
+    {
+        // Load entities into database
+        $this->_em->persist($product = new EagerProduct(11149));
+        $this->_em->persist($locale = new Locale('fr_FR'));
+        $this->_em->persist(new EagerProductTranslation($product, $locale));
+        $this->_em->flush();
+        $this->_em->clear();
+
+        // Fetch entity from database
+        $product = $this->_em->find(EagerProduct::class, 11149);
+
+        // Assert associated entity is loaded eagerly
+        static::assertInstanceOf(EagerProduct::class, $product);
+        static::assertInstanceOf(PersistentCollection::class, $product->translations);
+        static::assertTrue($product->translations->isInitialized());
+        static::assertCount(1, $product->translations);
+
+        // Assert associated entity is indexed by given property
+        $translation = $product->translations->get('fr_FR');
+        static::assertInstanceOf(EagerProductTranslation::class, $translation);
+        static::assertNotInstanceOf(Proxy::class, $translation);
+    }
+}
diff --git a/tests/Tests/ORM/Functional/Ticket/GH11149/Locale.php b/tests/Tests/ORM/Functional/Ticket/GH11149/Locale.php
new file mode 100644
index 00000000000..90feaebad21
--- /dev/null
+++ b/tests/Tests/ORM/Functional/Ticket/GH11149/Locale.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity]
+#[ORM\Table('gh11149_locale')]
+class Locale
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'string', enumType: LocaleCode::class)]
+    public LocaleCode $code;
+
+    public function __construct(string $code)
+    {
+        $this->code = LocaleCode::from($code);
+    }
+}
diff --git a/tests/Tests/ORM/Functional/Ticket/GH11149/LocaleCode.php b/tests/Tests/ORM/Functional/Ticket/GH11149/LocaleCode.php
new file mode 100644
index 00000000000..f8ef5e1b15e
--- /dev/null
+++ b/tests/Tests/ORM/Functional/Ticket/GH11149/LocaleCode.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+enum LocaleCode: string
+{
+    case Dutch = 'nl_NL';
+    case French = 'fr_FR';
+    case German = 'de_DE';
+}
diff --git a/tests/Tests/ORM/Functional/Ticket/GH11149/RegularProduct.php b/tests/Tests/ORM/Functional/Ticket/GH11149/RegularProduct.php
new file mode 100644
index 00000000000..65e85564d89
--- /dev/null
+++ b/tests/Tests/ORM/Functional/Ticket/GH11149/RegularProduct.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity]
+#[ORM\Table('gh11149_regular_product')]
+class RegularProduct
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'integer')]
+    public int $id;
+
+    #[ORM\OneToMany(
+        targetEntity: RegularProductTranslation::class,
+        mappedBy: 'product',
+        indexBy: 'locale_code',
+    )]
+    public Collection $translations;
+
+    public function __construct(int $id)
+    {
+        $this->id           = $id;
+        $this->translations = new ArrayCollection();
+    }
+}
diff --git a/tests/Tests/ORM/Functional/Ticket/GH11149/RegularProductTranslation.php b/tests/Tests/ORM/Functional/Ticket/GH11149/RegularProductTranslation.php
new file mode 100644
index 00000000000..99427badba6
--- /dev/null
+++ b/tests/Tests/ORM/Functional/Ticket/GH11149/RegularProductTranslation.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity]
+#[ORM\Table('gh11149_regular_product_translation')]
+class RegularProductTranslation
+{
+    #[ORM\Id]
+    #[ORM\ManyToOne(targetEntity: RegularProduct::class, inversedBy: 'translations')]
+    #[ORM\JoinColumn(nullable: false)]
+    public RegularProduct $product;
+
+    #[ORM\Id]
+    #[ORM\ManyToOne(targetEntity: Locale::class)]
+    #[ORM\JoinColumn(name: 'locale_code', referencedColumnName: 'code', nullable: false)]
+    public Locale $locale;
+
+    public function __construct(RegularProduct $product, Locale $locale)
+    {
+        $this->product = $product;
+        $this->locale  = $locale;
+    }
+}