diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index 3e17081246b60..9932e34272396 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -1548,7 +1548,7 @@ private function registerMessengerConfiguration(array $config, ContainerBuilder
             }
 
             if ($container->getParameter('kernel.debug') && class_exists(Stopwatch::class)) {
-                array_unshift($middleware, array('id' => 'traceable', 'arguments' => array($busId)));
+                array_unshift($middleware, array('id' => 'traceable', 'arguments' => array(1 => $busId)));
             }
 
             $container->setParameter($busId.'.middleware', $middleware);
diff --git a/src/Symfony/Component/Messenger/DependencyInjection/MessengerPass.php b/src/Symfony/Component/Messenger/DependencyInjection/MessengerPass.php
index 573907b86ef1b..d595015f5c0e0 100644
--- a/src/Symfony/Component/Messenger/DependencyInjection/MessengerPass.php
+++ b/src/Symfony/Component/Messenger/DependencyInjection/MessengerPass.php
@@ -319,7 +319,8 @@ private function registerBusMiddleware(ContainerBuilder $container, string $busI
             if (($definition = $container->findDefinition($messengerMiddlewareId))->isAbstract()) {
                 $childDefinition = new ChildDefinition($messengerMiddlewareId);
                 $count = \count($definition->getArguments());
-                foreach (array_values($arguments ?? array()) as $key => $argument) {
+
+                foreach (($arguments ?? array()) as $key => $argument) {
                     // Parent definition can provide default arguments.
                     // Replace each explicitly or add if not set:
                     $key < $count ? $childDefinition->replaceArgument($key, $argument) : $childDefinition->addArgument($argument);
diff --git a/src/Symfony/Component/Messenger/Tests/DependencyInjection/MessengerPassTest.php b/src/Symfony/Component/Messenger/Tests/DependencyInjection/MessengerPassTest.php
index 0795b2b179c33..cc7cae6e260ba 100644
--- a/src/Symfony/Component/Messenger/Tests/DependencyInjection/MessengerPassTest.php
+++ b/src/Symfony/Component/Messenger/Tests/DependencyInjection/MessengerPassTest.php
@@ -494,12 +494,14 @@ public function testRegistersMiddlewareFromServices()
         $container = $this->getContainerBuilder($fooBusId = 'messenger.bus.foo');
         $container->register('middleware_with_factory', UselessMiddleware::class)->addArgument('some_default')->setAbstract(true);
         $container->register('middleware_with_factory_using_default', UselessMiddleware::class)->addArgument('some_default')->setAbstract(true);
+        $container->register('middleware_with_factory_using_a_lot_of_defaults', UselessMiddleware::class)->setArguments(array('one', 'two', 'three'))->setAbstract(true);
         $container->register(UselessMiddleware::class, UselessMiddleware::class);
 
         $container->setParameter($middlewareParameter = $fooBusId.'.middleware', array(
             array('id' => UselessMiddleware::class),
             array('id' => 'middleware_with_factory', 'arguments' => array('foo', 'bar')),
             array('id' => 'middleware_with_factory_using_default'),
+            array('id' => 'middleware_with_factory_using_a_lot_of_defaults', 'arguments' => array(1 => '2', 3 => 'four')),
         ));
 
         (new MessengerPass())->process($container);
@@ -519,10 +521,18 @@ public function testRegistersMiddlewareFromServices()
             'parent default argument is used'
         );
 
+        $this->assertTrue($container->hasDefinition($factoryWithALotOfDefaultsChildMiddlewareId = $fooBusId.'.middleware.middleware_with_factory_using_a_lot_of_defaults'));
+        $this->assertEquals(
+            array('one', '2', 'three', 'four'),
+            $container->getDefinition($factoryWithALotOfDefaultsChildMiddlewareId)->getArguments(),
+            'parent arguments are not overwritten'
+        );
+
         $this->assertEquals(array(
             new Reference(UselessMiddleware::class),
             new Reference($factoryChildMiddlewareId),
             new Reference($factoryWithDefaultChildMiddlewareId),
+            new Reference($factoryWithALotOfDefaultsChildMiddlewareId),
         ), $container->getDefinition($fooBusId)->getArgument(0)->getValues());
         $this->assertFalse($container->hasParameter($middlewareParameter));
     }