diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php
index 58fc95b5fc55c..402aca6378b63 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php
@@ -84,6 +84,8 @@ public function process(ContainerBuilder $container)
         } finally {
             BaseNode::resetPlaceholders();
         }
+
+        $resolvingBag->clearUnusedEnvPlaceholders();
     }
 
     private static function getType($value): string
diff --git a/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php b/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php
index 3c68af031f406..20fc77c8b4693 100644
--- a/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php
+++ b/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php
@@ -87,6 +87,11 @@ public function getUnusedEnvPlaceholders(): array
         return $this->unusedEnvPlaceholders;
     }
 
+    public function clearUnusedEnvPlaceholders()
+    {
+        $this->unusedEnvPlaceholders = array();
+    }
+
     /**
      * Merges the env placeholders of another EnvPlaceholderParameterBag.
      */
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
index 0fb2f6dc91a43..b5841f343a4e8 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
@@ -226,7 +226,7 @@ public function testEnvWithVariableNode(): void
     public function testConfigurationWithoutRootNode(): void
     {
         $container = new ContainerBuilder();
-        $container->registerExtension($ext = new EnvExtension(new EnvConfigurationWithoutRootNode()));
+        $container->registerExtension(new EnvExtension(new EnvConfigurationWithoutRootNode()));
         $container->loadFromExtension('env_extension');
 
         $this->doProcess($container);
@@ -234,6 +234,21 @@ public function testConfigurationWithoutRootNode(): void
         $this->addToAssertionCount(1);
     }
 
+    public function testDiscardedEnvInConfig(): void
+    {
+        $container = new ContainerBuilder();
+        $container->setParameter('env(BOOLISH)', '1');
+        $container->setParameter('boolish', '%env(BOOLISH)%');
+        $container->registerExtension(new EnvExtension());
+        $container->prependExtensionConfig('env_extension', array(
+            'array_node' => array('bool_force_cast' => '%boolish%'),
+        ));
+
+        $container->compile(true);
+
+        $this->assertSame('1', $container->getParameter('boolish'));
+    }
+
     private function doProcess(ContainerBuilder $container): void
     {
         (new MergeExtensionConfigurationPass())->process($container);
@@ -260,8 +275,19 @@ public function getConfigTreeBuilder()
                         ->ifTrue(function ($value) { return !is_array($value); })
                         ->then(function ($value) { return array('child_node' => $value); })
                     ->end()
+                    ->beforeNormalization()
+                        ->ifArray()
+                        ->then(function (array $v) {
+                            if (isset($v['bool_force_cast'])) {
+                                $v['bool_force_cast'] = (bool) $v['bool_force_cast'];
+                            }
+
+                            return $v;
+                        })
+                    ->end()
                     ->children()
                         ->scalarNode('child_node')->end()
+                        ->booleanNode('bool_force_cast')->end()
                         ->integerNode('int_unset_at_zero')
                             ->validate()
                                 ->ifTrue(function ($value) { return 0 === $value; })

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