only in patch2:
unchanged:
--- a/core/modules/menu_link/src/StaticMenuLinks.php
+++ b/core/modules/menu_link/src/StaticMenuLinks.php
@@ -69,7 +69,7 @@ public function getLinks() {
    *   An YAML discovery instance.
    */
   protected function getDiscovery() {
-    return new YamlDiscovery('menu_links', $this->moduleHandler->getModuleDirectories());
+    return new YamlDiscovery('links.menu', $this->moduleHandler->getModuleDirectories());
   }
 
 }