diff --git a/core/lib/Drupal/Core/Extension/ModuleExtensionList.php b/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
index 10570ee..cdc504f 100644
--- a/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
+++ b/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
@@ -7,8 +7,12 @@
 
 namespace Drupal\Core\Extension;
 
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
 class ModuleExtensionList extends ExtensionList {
 
+  use StringTranslationTrait;
+
   protected $defaults = [
     'dependencies' => [],
     'description' => '',
@@ -42,6 +46,12 @@ protected function doScanExtensions(ExtensionDiscovery $discovery) {
   protected function doListExtensions() {
     $extensions = parent::doListExtensions();
 
+    // It is possible that a module was marked as required by
+    // hook_system_info_alter() and modules that it depends on are not required.
+    foreach ($extensions as $extension) {
+      $this->moduleDataEnsureRequired($extension, $extensions);
+    }
+
     if ($profile = drupal_get_profile()) {
       // Installation profiles are hidden by default, unless explicitly specified
       // otherwise in the .info.yml file.
@@ -61,12 +71,6 @@ protected function doListExtensions() {
       }
     }
 
-    // It is possible that a module was marked as required by
-    // hook_system_info_alter() and modules that it depends on are not required.
-    foreach ($extensions as $extension) {
-      $this->moduleDataEnsureRequired($extension, $extensions);
-    }
-
     return $extensions;
   }
 
@@ -84,7 +88,7 @@ protected function moduleDataEnsureRequired(Extension $module, array $modules =
         $dependency_name = ModuleHandler::parseDependency($dependency)['name'];
         if (!isset($modules[$dependency_name]->info['required'])) {
           $modules[$dependency_name]->info['required'] = TRUE;
-          $modules[$dependency_name]->info['explanation'] = t('Dependency of required module @module', array('@module' => $module->info['name']));
+          $modules[$dependency_name]->info['explanation'] = $this->t('Dependency of required module @module', array('@module' => $module->info['name']));
           // Ensure any dependencies it has are required.
          $this->moduleDataEnsureRequired($modules[$dependency_name], $modules);
         }
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index c35764e..dbe3b2c 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -882,6 +882,7 @@ function system_get_info($type, $name = NULL) {
  *   An associative array of module information.
  */
 function _system_rebuild_module_data() {
+  \Drupal::service('module_listing')->reset();
   return \Drupal::service('module_listing')->listExtensions();
 }