diff --git a/core/includes/menu.inc b/core/includes/menu.inc
index 5eac915..307e389 100644
--- a/core/includes/menu.inc
+++ b/core/includes/menu.inc
@@ -2105,7 +2105,8 @@ function _menu_get_legacy_tasks($router_item, &$data, &$root_path) {
           // MENU_IS_LOCAL_ACTION before checking.
           if (($item['type'] & MENU_IS_LOCAL_ACTION) == MENU_IS_LOCAL_ACTION) {
             // The item is an action, display it as such.
-            $actions_current[$link['href']] = array(
+            $key = isset($link['route_name']) ? $link['route_name'] : $link['href'];
+            $actions_current[$key] = array(
               '#theme' => 'menu_local_action',
               '#link' => $link,
               '#weight' => isset($link['weight']) ? $link['weight'] : NULL,
@@ -2333,8 +2334,7 @@ function menu_get_local_actions() {
   $links = menu_local_tasks();
   $route_name = Drupal::request()->attributes->get(RouteObjectInterface::ROUTE_NAME);
   $manager = \Drupal::service('plugin.manager.menu.local_action');
-  $links['actions'] += $manager->getActionsForRoute($route_name);
-  return $links['actions'];
+  return $manager->getActionsForRoute($route_name) + $links['actions'];
 }
 
 /**
diff --git a/core/modules/system/lib/Drupal/system/Tests/Menu/LocalActionTest.php b/core/modules/system/lib/Drupal/system/Tests/Menu/LocalActionTest.php
index d8804dd..de61cb8 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Menu/LocalActionTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Menu/LocalActionTest.php
@@ -37,8 +37,8 @@ public function testLocalAction() {
     $this->drupalGet('menu-test-local-action');
     // Ensure that both menu and route based actions are shown.
     $this->assertLocalAction(array(
-      'menu-test-local-action/dynamic-title' => 'My dynamic-title action',
       'menu-test-local-action/hook_menu' => 'My hook_menu action',
+      'menu-test-local-action/dynamic-title' => 'My dynamic-title action',
       'menu-test-local-action/routing' => 'My YAML discovery action',
       'menu-test-local-action/routing2' => 'Title override',
     ));