Issue #3222666 by gpotter, theRuslan, Chi, smustgrave, superbiche, letrollpoilu: drupal_menu() incorrectly caches the active parent menu item in two-leveled menu

src/TwigExtension.php

@@ -716,7 +716,7 @@ class TwigExtension extends AbstractExtension {
     $parameters->setMinDepth($level);
     // When the depth is configured to zero, there is no depth limit. When depth
     // is non-zero, it indicates the number of levels that must be displayed.
-    // Hence this is a relative depth that we must convert to an actual
+    // Hence, this is a relative depth that we must convert to an actual
     // (absolute) depth, that may never exceed the maximum depth.
     if ($depth > 0) {
       $parameters->setMaxDepth(min($level + $depth - 1, $menu_tree->maxDepth()));
@@ -733,7 +733,10 @@ class TwigExtension extends AbstractExtension {
       ['callable' => 'menu.default_tree_manipulators:generateIndexAndSort'],
     ];
     $tree = $menu_tree->transform($tree, $manipulators);
-    return $menu_tree->build($tree);
+    $build = $menu_tree->build($tree);
+
+    $build['#cache']['contexts'][] = 'route.menu_active_trails:' . $menu_name;
+    return $build;
   }
 
   /**