diff --git a/rules-tests/CodeQuality/Rector/Property/ImproveDoctrineCollectionDocTypeInEntityRector/Fixture/OneToMany/with_index_by_integer_attribute_on_both.php.inc b/rules-tests/CodeQuality/Rector/Property/ImproveDoctrineCollectionDocTypeInEntityRector/Fixture/OneToMany/with_index_by_integer_attribute_on_both.php.inc
new file mode 100644
index 00000000..e7d9d861
--- /dev/null
+++ b/rules-tests/CodeQuality/Rector/Property/ImproveDoctrineCollectionDocTypeInEntityRector/Fixture/OneToMany/with_index_by_integer_attribute_on_both.php.inc
@@ -0,0 +1,43 @@
+<?php
+
+namespace Rector\Doctrine\Tests\CodeQuality\Rector\Property\ImproveDoctrineCollectionDocTypeInEntityRector\Fixture\OneToMany;
+
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+use Rector\Doctrine\Tests\CodeQuality\Rector\Property\ImproveDoctrineCollectionDocTypeInEntityRector\Source\TrainingWithIntegerIdAttribute;
+
+/**
+ * @ORM\Entity
+ */
+class WithIndexByIntegerAttributeOnBoth
+{
+    /**
+     * @var Collection<int, string>|TrainingWithIntegerIdAttribute[]
+     */
+    #[ORM\OneToMany(targetEntity: TrainingWithIntegerIdAttribute::class, mappedBy: 'trainer', indexBy: 'id')]
+    private $trainings = [];
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Doctrine\Tests\CodeQuality\Rector\Property\ImproveDoctrineCollectionDocTypeInEntityRector\Fixture\OneToMany;
+
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+use Rector\Doctrine\Tests\CodeQuality\Rector\Property\ImproveDoctrineCollectionDocTypeInEntityRector\Source\TrainingWithIntegerIdAttribute;
+
+/**
+ * @ORM\Entity
+ */
+class WithIndexByIntegerAttributeOnBoth
+{
+    /**
+     * @var \Doctrine\Common\Collections\Collection<int, \Rector\Doctrine\Tests\CodeQuality\Rector\Property\ImproveDoctrineCollectionDocTypeInEntityRector\Source\TrainingWithIntegerIdAttribute>
+     */
+    #[ORM\OneToMany(targetEntity: TrainingWithIntegerIdAttribute::class, mappedBy: 'trainer', indexBy: 'id')]
+    private $trainings = [];
+}
+
+?>