diff --git a/src/Symfony/Component/Config/Builder/ConfigBuilderGenerator.php b/src/Symfony/Component/Config/Builder/ConfigBuilderGenerator.php
index 86a08a2fa6c91..63b309d78647c 100644
--- a/src/Symfony/Component/Config/Builder/ConfigBuilderGenerator.php
+++ b/src/Symfony/Component/Config/Builder/ConfigBuilderGenerator.php
@@ -172,17 +172,20 @@ private function handlePrototypedArrayNode(PrototypedArrayNode $node, ClassBuild
         if (null !== $parameterType || $prototype instanceof ScalarNode) {
             $property = $class->addProperty($node->getName());
             if (null === $key = $node->getKeyAttribute()) {
+                // This is an array of values; don't use singular name
                 $body = '
 /**
+ * @param list<TYPE> $value
  * @return $this
  */
-public function NAME(TYPE$value): self
+public function NAME(array $value): self
 {
     $this->PROPERTY = $value;
 
     return $this;
 }';
-                $class->addMethod($methodName, $body, ['PROPERTY' => $property->getName(), 'TYPE' => '' === $parameterType ? '' : $parameterType.' ']);
+
+                $class->addMethod($node->getName(), $body, ['PROPERTY' => $property->getName(), 'TYPE' => '' === $parameterType ? 'mixed' : $parameterType]);
             } else {
                 $body = '
 /**
diff --git a/src/Symfony/Component/Config/Tests/Builder/Fixtures/AddToList.config.php b/src/Symfony/Component/Config/Tests/Builder/Fixtures/AddToList.config.php
index ce8fbb432bb97..b35be9d943aab 100644
--- a/src/Symfony/Component/Config/Tests/Builder/Fixtures/AddToList.config.php
+++ b/src/Symfony/Component/Config/Tests/Builder/Fixtures/AddToList.config.php
@@ -3,7 +3,7 @@
 use Symfony\Config\AddToListConfig;
 
 return static function (AddToListConfig $config) {
-    $config->translator()->fallback(['sv', 'fr', 'es']);
+    $config->translator()->fallbacks(['sv', 'fr', 'es']);
     $config->translator()->source('\\Acme\\Foo', 'yellow');
     $config->translator()->source('\\Acme\\Bar', 'green');
 
diff --git a/src/Symfony/Component/Config/Tests/Builder/Fixtures/AddToList.php b/src/Symfony/Component/Config/Tests/Builder/Fixtures/AddToList.php
index 66e5163a262cf..3be63c8f428fd 100644
--- a/src/Symfony/Component/Config/Tests/Builder/Fixtures/AddToList.php
+++ b/src/Symfony/Component/Config/Tests/Builder/Fixtures/AddToList.php
@@ -35,6 +35,7 @@ public function getConfigTreeBuilder(): TreeBuilder
                             ->useAttributeAsKey('message_class')
                             ->prototype('array')
                                 ->performNoDeepMerging()
+                                ->fixXmlConfig('sender')
                                 ->children()
                                     ->arrayNode('senders')
                                         ->requiresAtLeastOneElement()
diff --git a/src/Symfony/Component/Config/Tests/Builder/Fixtures/NodeInitialValues.config.php b/src/Symfony/Component/Config/Tests/Builder/Fixtures/NodeInitialValues.config.php
index c7f023d0c57fc..4ebc4df24c392 100644
--- a/src/Symfony/Component/Config/Tests/Builder/Fixtures/NodeInitialValues.config.php
+++ b/src/Symfony/Component/Config/Tests/Builder/Fixtures/NodeInitialValues.config.php
@@ -11,5 +11,5 @@
     $config->messenger()
         ->transports('slow_queue')
         ->dsn('doctrine://')
-        ->option(['table'=>'my_messages']);
+        ->options(['table'=>'my_messages']);
 };
diff --git a/src/Symfony/Component/Config/Tests/Builder/GeneratedConfigTest.php b/src/Symfony/Component/Config/Tests/Builder/GeneratedConfigTest.php
index 767ebe5452ed0..c033d70086b28 100644
--- a/src/Symfony/Component/Config/Tests/Builder/GeneratedConfigTest.php
+++ b/src/Symfony/Component/Config/Tests/Builder/GeneratedConfigTest.php
@@ -104,7 +104,8 @@ private function generateConfigBuilder(string $configurationClass)
             return new $fqcn();
         }
 
-        $outputDir = sys_get_temp_dir();
+        $outputDir = sys_get_temp_dir().\DIRECTORY_SEPARATOR.uniqid('sf_config_builder', true);
+
         // This line is helpful for debugging
         // $outputDir = __DIR__.'/.build';