Taras Korpach
--- a/core/modules/system/src/Access/SystemAdminMenuBlockAccessCheck.php
+++ b/core/modules/system/src/Access/SystemAdminMenuBlockAccessCheck.php

      // If access is allowed to this element in the tree check for access to
      // its own children.
-      // If access is allowed to this element in the tree check for access to
-      // its own children.
+      // If access is allowed to this element in the tree, check for access to
+      // any of its own children.
--- a/core/modules/system/src/Access/SystemAdminMenuBlockAccessCheck.php
+++ b/core/modules/system/src/Access/SystemAdminMenuBlockAccessCheck.php

-    if (empty($tree)) {
-      $route = $this->router->getRouteCollection()->get($link->getRouteName());
-      if ($route) {
-        return AccessResult::allowedIf(
-          empty($route->getRequirement('_access_admin_menu_block_page'))
-          && empty($route->getRequirement('_access_admin_overview_page'))
-        );
-      }
-      return AccessResult::neutral();
+    $route = $this->router->getRouteCollection()->get($link->getRouteName());
+    if ($route && empty($route->getRequirement('_access_admin_menu_block_page')) && empty($route->getRequirement('_access_admin_overview_page'))) {
+      return AccessResult::allowed();
    }

    foreach ($tree as $element) {
-    $tree = $this->menuLinkTree->load(NULL, $parameters);
-
-    $route = $this->router->getRouteCollection()->get($link->getRouteName());
-    if ($route && empty($route->getRequirement('_access_admin_menu_block_page')) && empty($route->getRequirement('_access_admin_overview_page'))) {
-      return AccessResult::allowed();
-    }
-
-    foreach ($tree as $element) {
+    $route = $this->router->getRouteCollection()->get($link->getRouteName());
+    if ($route && empty($route->getRequirement('_access_admin_menu_block_page')) && empty($route->getRequirement('_access_admin_overview_page'))) {
+      return AccessResult::allowed();
+    }
+
+    foreach ($this->menuLinkTree->load(NULL, $parameters) as $element) {