Kunal Sachdev
--- a/core/modules/menu_ui/menu_ui.post_update.php 0 → 100644
+++ b/core/modules/menu_ui/menu_ui.post_update.php 0 → 100644
+ * Post update functions for menu_ui.
+ */
+
+/**
+ * Adds link_by_default config in node.type.*.third_party.menu_ui settings.
+ */
+function menu_ui_post_update_add_link_by_default() {
+  $config_factory = \Drupal::configFactory();
+  foreach ($config_factory->listAll('node.type.') as $node_type_config_name) {
+    $node_type_settings = $config_factory->getEditable($node_type_config_name);
+    $node_type_third_party_menu_ui_settings = $node_type_settings->get('third_party_settings.menu_ui');
+    if (is_null($node_type_third_party_menu_ui_settings)) {
+      continue;
+    }
+    $node_type_third_party_menu_ui_settings['link_by_default'] = FALSE;
+    $node_type_settings->set('third_party_settings.menu_ui', $node_type_third_party_menu_ui_settings)->save(TRUE);