ISTWCMS-4600: Fix for display of inaccessible menu items.

src/Plugin/Block/ContentManagementMenuBlock.php

@@ -57,7 +57,11 @@ class ContentManagementMenuBlock extends BlockBase implements ContainerFactoryPl
             // been configured. If not (else block) use secondary menu by
             // default.
             if (isset($configured[$id])) {
-              $selected_secondary = array_keys(array_filter($configured[$id] + $secondary_menu));
+              foreach ($secondary_menu as $key => $value) {
+                if (!empty($configured[$id][$key])) {
+                  $selected_secondary[] = $key;
+                }
+              }
             }
             else {
               $selected_secondary = array_keys($secondary_menu);