diff --git a/src/Mapping/Driver/ReflectionBasedDriver.php b/src/Mapping/Driver/ReflectionBasedDriver.php
index a2900d13e01..9becf228a31 100644
--- a/src/Mapping/Driver/ReflectionBasedDriver.php
+++ b/src/Mapping/Driver/ReflectionBasedDriver.php
@@ -32,8 +32,13 @@ private function isRepeatedPropertyDeclaration(ReflectionProperty $property, Cla
                 || $metadata->isInheritedEmbeddedClass($property->name);
         }
 
+        /** @var class-string $declaringClass */
         $declaringClass = $property->class;
 
+        if ($this->isTransient($declaringClass)) {
+            return isset($metadata->fieldMappings[$property->name]);
+        }
+
         if (
             isset($metadata->fieldMappings[$property->name]['declared'])
             && $metadata->fieldMappings[$property->name]['declared'] === $declaringClass
diff --git a/tests/Tests/ORM/Functional/Ticket/GH10450Test.php b/tests/Tests/ORM/Functional/Ticket/GH10450Test.php
index c522049f820..afe75d3bcdf 100644
--- a/tests/Tests/ORM/Functional/Ticket/GH10450Test.php
+++ b/tests/Tests/ORM/Functional/Ticket/GH10450Test.php
@@ -32,6 +32,15 @@ public function classesThatOverrideFieldNames(): Generator
         yield 'Entity class that redeclares a protected field inherited from a base entity' => [GH10450EntityChildProtected::class];
         yield 'Entity class that redeclares a protected field inherited from a mapped superclass' => [GH10450MappedSuperclassChildProtected::class];
     }
+
+    public function testFieldsOfTransientClassesAreNotConsideredDuplicate(): void
+    {
+        $em = $this->getTestEntityManager();
+
+        $metadata = $em->getClassMetadata(GH10450Cat::class);
+
+        self::assertArrayHasKey('id', $metadata->fieldMappings);
+    }
 }
 
 /**
@@ -179,3 +188,38 @@ class GH10450MappedSuperclassChildProtected extends GH10450BaseMappedSuperclassP
      */
     protected $field;
 }
+
+abstract class GH10450AbstractEntity
+{
+    /**
+     * @ORM\Column(type="integer")
+     * @ORM\Id
+     * @ORM\GeneratedValue
+     *
+     * @var int
+     */
+    protected $id;
+}
+
+/**
+ * @ORM\Entity
+ * @ORM\InheritanceType("SINGLE_TABLE")
+ * @ORM\DiscriminatorMap({ "cat": "GH10450Cat" })
+ * @ORM\DiscriminatorColumn(name="type")
+ */
+abstract class GH10450Animal extends GH10450AbstractEntity
+{
+    /**
+     * @ORM\Column(type="text", name="base")
+     *
+     * @var string
+     */
+    private $field;
+}
+
+/**
+ * @ORM\Entity
+ */
+class GH10450Cat extends GH10450Animal
+{
+}