Patch menu position rule module for orphaned items

composer.json

@@ -334,7 +334,8 @@
                 "https://www.drupal.org/project/menu_link_weight/issues/2995896": "https://www.drupal.org/files/issues/2018-08-29/2995896-menu-admin-per-menu-support-fixes.patch"
             },
             "drupal/menu_position": {
-                "https://www.drupal.org/project/menu_position/issues/3110502": "https://www.drupal.org/files/issues/2020-07-29/drupal-menu_position-WSOD-when-menu-parent-no-longer-exists-3110502-26.patch"
+                "https://www.drupal.org/project/menu_position/issues/3110502": "https://www.drupal.org/files/issues/2020-07-29/drupal-menu_position-WSOD-when-menu-parent-no-longer-exists-3110502-26.patch",
+                "Clean menu tree": "patches/contrib/menu_postion_rule-edit_route.patch"
             },
             "drupal/paragraphs": {
                 "https://www.drupal.org/project/paragraphs/issues/2895561": "https://www.drupal.org/files/issues/2021-05-06/paragraphs-2895561-32.patch"

patches/contrib/menu_postion_rule-edit_route.patch

@@ -0,0 +1,29 @@
+diff --git a/src/Plugin/Menu/MenuPositionLink.php b/src/Plugin/Menu/MenuPositionLink.php
+index 0724d3a..cd22a83 100644
+--- a/src/Plugin/Menu/MenuPositionLink.php
++++ b/src/Plugin/Menu/MenuPositionLink.php
+@@ -6,6 +6,7 @@ use Drupal\Core\Config\ConfigFactoryInterface;
+ use Drupal\Core\Controller\TitleResolverInterface;
+ use Drupal\Core\Entity\EntityTypeManagerInterface;
+ use Drupal\Core\Menu\MenuLinkBase;
++use Drupal\Core\Menu\MenuTreeStorage;
+ use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+ use Drupal\Core\Render\RendererInterface;
+ use Drupal\Core\Routing\AdminContext;
+@@ -214,8 +215,14 @@ class MenuPositionLink extends MenuLinkBase implements ContainerFactoryPluginInt
+   public function getEditRoute() {
+     $storage = $this->entityTypeManager->getStorage('menu_position_rule');
+     $entity_id = $this->pluginDefinition['metadata']['entity_id'];
+-    $entity = $storage->load($entity_id);
+-    return $entity->toUrl();
++    if ($entity = $storage->load($entity_id)) {
++      return $entity->toUrl();
++    }
++    \Drupal::service('menu.tree_storage')
++      ->delete($this->pluginDefinition['id']);
++    $this->messenger()
++      ->addError($this->t('Unable to load menu position rule %entity_id. It has been deleted from the menu tree.', ['%entity_id' => $entity_id]));
++    return NULL;
+   }
+
+ }