diff --git a/core/modules/system/src/Access/SystemAdminMenuBlockAccessCheck.php b/core/modules/system/src/Access/SystemAdminMenuBlockAccessCheck.php
index a527605ea7..ebc880bd2d 100644
--- a/core/modules/system/src/Access/SystemAdminMenuBlockAccessCheck.php
+++ b/core/modules/system/src/Access/SystemAdminMenuBlockAccessCheck.php
@@ -84,12 +84,9 @@ protected function hasAccessToChildMenuItems(MenuLinkInterface $link, AccountInt
 
     $tree = $this->menuLinkTree->load(NULL, $parameters);
 
-    if (empty($tree)) {
-      $route = $this->router->getRouteCollection()->get($link->getRouteName());
-      if ($route) {
-        return AccessResult::allowedIf(empty($route->getRequirement('_access_admin_menu_block_page')));
-      }
-      return AccessResult::neutral();
+    $route = $this->router->getRouteCollection()->get($link->getRouteName());
+    if ($route && empty($route->getRequirement('_access_admin_menu_block_page'))) {
+      return AccessResult::allowed();
     }
 
     foreach ($tree as $element) {
@@ -99,7 +96,9 @@ protected function hasAccessToChildMenuItems(MenuLinkInterface $link, AccountInt
 
       // If access is allowed to this element in the tree check for access to
       // its own children.
-      return AccessResult::allowedIf($this->hasAccessToChildMenuItems($element->link, $account)->isAllowed());
+      if ($this->hasAccessToChildMenuItems($element->link, $account)->isAllowed()) {
+        return AccessResult::allowed();
+      }
     }
     return AccessResult::neutral();
   }
diff --git a/core/modules/system/tests/modules/menu_test/menu_test.links.menu.yml b/core/modules/system/tests/modules/menu_test/menu_test.links.menu.yml
index d694e419b8..e2d9dd4953 100644
--- a/core/modules/system/tests/modules/menu_test/menu_test.links.menu.yml
+++ b/core/modules/system/tests/modules/menu_test/menu_test.links.menu.yml
@@ -35,6 +35,11 @@ menu_test.parent_test.child3_test:
   description: 'Menu item description child3'
   route_name: menu_test.child3_test
   parent: menu_test.parent_test
+menu_test.parent_test.child4_test:
+  title: 'Menu child4'
+  description: 'Menu item description child4'
+  route_name: menu_test.child4_test
+  parent: menu_test.parent_test
 menu_test.parent_test.child_test.super_child1_test:
   title: 'Menu super child1'
   description: 'Menu item description super child1'
@@ -50,6 +55,11 @@ menu_test.parent_test.child_test.super_child3_test:
   description: 'Menu item description super child3'
   route_name: menu_test.super_child3_test
   parent: menu_test.parent_test.child2_test
+menu_test.parent_test.child_test.super_child4_test:
+  title: 'Menu super child4'
+  description: 'Menu item description super child4'
+  route_name: menu_test.super_child4_test
+  parent: menu_test.parent_test.child4_test
 menu_test.menu_parent_test_param:
   title: 'Menu Parent Param'
   description: 'Menu item description parent'
diff --git a/core/modules/system/tests/modules/menu_test/menu_test.permissions.yml b/core/modules/system/tests/modules/menu_test/menu_test.permissions.yml
index 47c528f012..69ed5629f4 100644
--- a/core/modules/system/tests/modules/menu_test/menu_test.permissions.yml
+++ b/core/modules/system/tests/modules/menu_test/menu_test.permissions.yml
@@ -7,6 +7,9 @@ access child1 test page:
 access child2 test page:
   title: 'Access child2 test page'
   restrict access: true
+access child4 test page:
+  title: 'Access child4 test page'
+  restrict access: true
 access super child1 test page:
   title: 'Access super child1 test page'
   restrict access: true
@@ -16,3 +19,6 @@ access super child2 test page:
 access super child3 test page:
   title: 'Access super child3 test page'
   restrict access: true
+access super child4 test page:
+  title: 'Access super child4 test page'
+  restrict access: true
diff --git a/core/modules/system/tests/modules/menu_test/menu_test.routing.yml b/core/modules/system/tests/modules/menu_test/menu_test.routing.yml
index 5b83aeb2af..0c359e350e 100644
--- a/core/modules/system/tests/modules/menu_test/menu_test.routing.yml
+++ b/core/modules/system/tests/modules/menu_test/menu_test.routing.yml
@@ -66,6 +66,20 @@ menu_test.child3_test:
   requirements:
     _access: 'TRUE'
 
+menu_test.child4_test:
+  path: '/parent_test/child4_test'
+  defaults:
+    _controller: '\Drupal\test_page_test\Controller\TestPageTestController::testPage'
+  requirements:
+    _permission: 'access child4 test page'
+
+menu_test.super_child4_test:
+  path: '/parent_test/child4_test/super_child4_test'
+  defaults:
+    _controller: '\Drupal\test_page_test\Controller\TestPageTestController::testPage'
+  requirements:
+    _permission: 'access super child4 test page'
+
 menu_test.super_child1_test:
   path: '/parent_test/child_test/super_child1_test'
   defaults:
diff --git a/core/modules/system/tests/src/Functional/Menu/MenuAccessTest.php b/core/modules/system/tests/src/Functional/Menu/MenuAccessTest.php
index 307fbf3613..c6c30bfbac 100644
--- a/core/modules/system/tests/src/Functional/Menu/MenuAccessTest.php
+++ b/core/modules/system/tests/src/Functional/Menu/MenuAccessTest.php
@@ -131,9 +131,11 @@ public function testSystemAdminMenuBlockAccessCheck(): void {
     // --menu_test.super_child2_test
     // --menu_test.super_child3_test
     // -menu_test.child3_test
-    // All routes in this tree except the "super_child" routes should have the
-    // '_access_admin_menu_block_page' requirement which denies access unless
-    // the user has access to a menu item under that route. Route
+    // -menu_test.child4_test
+    // --menu_test.super_child4_test
+    // All routes in this tree except the "super_child" and "child4_test" routes
+    // should have the '_access_admin_menu_block_page' requirement which denies
+    // access unless the user has access to a menu item under that route. Route
     // 'menu_test.child3_test' has no menu items underneath it so no user should
     // have access to this route even though it has the requirement
     // `_access: 'TRUE'`.
@@ -142,9 +144,11 @@ public function testSystemAdminMenuBlockAccessCheck(): void {
       'menu_test.child1_test',
       'menu_test.child2_test',
       'menu_test.child3_test',
+      'menu_test.child4_test',
       'menu_test.super_child1_test',
       'menu_test.super_child2_test',
       'menu_test.super_child3_test',
+      'menu_test.super_child4_test',
     ];
 
     // Create a user with access to only the top level parent.
@@ -178,16 +182,29 @@ public function testSystemAdminMenuBlockAccessCheck(): void {
       'access child2 test page',
       'access super child3 test page',
     ]);
+    $superChild4User = $this->drupalCreateUser([
+      'access parent test page',
+      'access child4 test page',
+      'access super child4 test page',
+    ]);
+    $child4NoSuperChild4User = $this->drupalCreateUser([
+      'access parent test page',
+      'access child4 test page',
+    ]);
+
     $noParentAccessUser = $this->drupalCreateUser([
       'access child1 test page',
       'access child2 test page',
+      'access child4 test page',
       'access super child1 test page',
       'access super child2 test page',
       'access super child3 test page',
+      'access super child4 test page',
     ]);
 
-    // Users that do not have access to any of the 'super_child' routes will
-    // not have access to any of the routes in the tree.
+    // Users that do not have access to any of the 'super_child' routes where
+    // the 'child' routes have the '_access_admin_menu_block_page' requirement
+    // will not have access to any of the routes in the tree.
     $this->assertUserRoutesAccess($parentUser, [], ...$tree_routes);
     $this->assertUserRoutesAccess($childOnlyUser, [], ...$tree_routes);
 
@@ -217,6 +234,19 @@ public function testSystemAdminMenuBlockAccessCheck(): void {
       // multiple items nested at the same level.
       ['menu_test.parent_test', 'menu_test.child2_test', 'menu_test.super_child3_test'],
       ...$tree_routes);
+    // Users who have only access to one super child route should have access
+    // only to that route and its parents.
+    $this->assertUserRoutesAccess(
+      $superChild4User,
+      ['menu_test.parent_test', 'menu_test.child4_test', 'menu_test.super_child4_test'],
+      ...$tree_routes);
+    // Users who don't have access to a super child route, but where the parent
+    // route does not have the '_access_admin_menu_block_page' requirement,
+    // should have access to that parent route, but not the super child.
+    $this->assertUserRoutesAccess(
+      $child4NoSuperChild4User,
+      ['menu_test.parent_test', 'menu_test.child4_test'],
+      ...$tree_routes);
 
     // Test a route that has parameter defined in the menu item.
     $this->drupalLogin($parentUser);