diff --git a/core/includes/menu.inc b/core/includes/menu.inc
index a8a30b6..a9b7d5f 100644
--- a/core/includes/menu.inc
+++ b/core/includes/menu.inc
@@ -2607,6 +2607,9 @@ function menu_router_rebuild() {
  *   (optional) Save the new router to the database. Defaults to FALSE.
  */
 function menu_router_build($save = FALSE) {
+  // Ensure that all configuration used to build the menu items are loaded
+  // without overrides.
+  config_context_enter('config.context.free');
   // We need to manually call each module so that we can know which module
   // a given item came from.
   $callbacks = array();
@@ -2621,6 +2624,8 @@ function menu_router_build($save = FALSE) {
   }
   // Alter the menu as defined in modules, keys are like user/%user.
   drupal_alter('menu', $callbacks);
+  // Return to the original context before menu building.
+  config_context_leave();
   foreach ($callbacks as $path => $router_item) {
     // If the menu item is a default local task and incorrectly references a
     // route, remove it.
diff --git a/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterTest.php b/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterTest.php
index 71cf0c4..ec8bdf3 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterTest.php
@@ -623,4 +623,24 @@ protected function doTestThemeCallbackHookCustomTheme() {
     $this->assertRaw('seven/style.css', "The Seven theme's CSS appears on the page.");
   }
 
+  /**
+   * Tests the context in menu router rebuild.
+   */
+  public function testMenuRouterRebuildContext() {
+    // Get the different contexts to ensure that the two services are not the same.
+    $config_context = \Drupal::service('menu_test.config_context');
+    $free_config_context = \Drupal::service('config.context.free');
+    $this->assertFalse(spl_object_hash($config_context) === spl_object_hash($free_config_context));
+
+    // Enter a context before the router rebuild.
+    config_context_enter('menu_test.config_context');
+    menu_router_rebuild();
+
+    $context_after = \Drupal::service('config.factory')->getContext();
+    $this->assertTrue(spl_object_hash($context_after) === spl_object_hash($config_context));
+
+    $context_inner = \Drupal::state()->get('menu_router_test.config_context');
+    $this->assertTrue(spl_object_hash($context_inner) == spl_object_hash($free_config_context));
+  }
+
 }
diff --git a/core/modules/system/tests/modules/menu_test/menu_test.module b/core/modules/system/tests/modules/menu_test/menu_test.module
index ab2ef30..4e614f9 100644
--- a/core/modules/system/tests/modules/menu_test/menu_test.module
+++ b/core/modules/system/tests/modules/menu_test/menu_test.module
@@ -293,6 +293,8 @@ function menu_test_menu() {
     'type' => MENU_LOCAL_TASK,
   );
 
+  \Drupal::state()->set('menu_router_test.config_context', \Drupal::service('config.factory')->getContext());
+
   return $items;
 }
 
diff --git a/core/modules/system/tests/modules/menu_test/menu_test.services.yml b/core/modules/system/tests/modules/menu_test/menu_test.services.yml
index 097ddf2..83da8ed 100644
--- a/core/modules/system/tests/modules/menu_test/menu_test.services.yml
+++ b/core/modules/system/tests/modules/menu_test/menu_test.services.yml
@@ -3,3 +3,9 @@ services:
     class: Drupal\menu_test\EventSubscriber\MaintenanceModeSubscriber
     tags:
       - { name: event_subscriber }
+
+  menu_test.config_context:
+    class: Drupal\Core\Config\Context\ContextInterface
+    factory_method: get
+    factory_service: config.context.factory
+    arguments: [Drupal\Core\Config\Context\FreeConfigContext]