Issue #3082032 by kristiaanvandeneynde:...

Issue #3082032 by kristiaanvandeneynde: ToolbarController::preRenderGetRenderedSubtrees() deletes parent's cacheability

core/modules/toolbar/src/Controller/ToolbarController.php

@@ -108,7 +108,7 @@ public static function preRenderGetRenderedSubtrees(array $data) {
     $tree = $menu_tree->transform($tree, $manipulators);
     $subtrees = [];
     // Calculated the combined cacheability of all subtrees.
-    $cacheability = new CacheableMetadata();
+    $cacheability = CacheableMetadata::createFromRenderArray($data);
     foreach ($tree as $element) {
       /** @var \Drupal\Core\Menu\MenuLinkInterface $link */
       $link = $element->link;