Wrong integration of field_collection delete form

This bug appears if you have field_collection installed and if you have some fields with this type.

If I open the page referenced by the menu: "Structure > menus > Administration" /admin/structure/menu/manage/admin I got the following error:

Symfony\Component\Routing\Exception\RouteNotFoundException: Route "entity.field_collection.delete_form" does not exist. in Drupal\Core\Routing\RouteProvider->getRouteByName() (line 187 of core/lib/Drupal/Core/Routing/RouteProvider.php).

Drupal\Core\Routing\UrlGenerator->getRoute('entity.field_collection.delete_form') (Line: 277)
Drupal\Core\Routing\UrlGenerator->generateFromRoute('entity.field_collection.delete_form', Array, Array, 1) (Line: 105)
Drupal\Core\Render\MetadataBubblingUrlGenerator->generateFromRoute('entity.field_collection.delete_form', Array, Array, 1) (Line: 735)
Drupal\Core\Url->toString(1) (Line: 162)
Drupal\Core\Utility\LinkGenerator->generate('Supprimer', Object) (Line: 94)
Drupal\Core\Render\Element\Link::preRenderLink(Array)
call_user_func(Array, Array) (Line: 381)

If I am not wrong, the menu items are generated by the function

function admin_toolbar_tools_menu_links_discovered_alter(&$links)

located in the admin_toolbar_tools.module file.

In this function, I can see the following:

function admin_toolbar_tools_menu_links_discovered_alter(&$links) {
.
.
.
  // Adds common links to entities.
  foreach ($content_entities as $module_name => $entities) {
    $config_entity = $entities['config_entity'];
    $content_entity = $entities['content_entity'];
    foreach ($entityTypeManager->getStorage($config_entity)->loadMultiple() as $machine_name => $bundle) {
.
.
.
      $links["entity." . $config_entity . ".delete_form." . $machine_name] = array(
        'title' => t('Delete'),
// HERE IS THE PROBLEM
        'route_name' => "entity." . $config_entity . ".delete_form",
//
        'menu_name' => 'admin',
        'parent' => "entity." . $config_entity . ".edit_form." . $machine_name,
        'route_parameters' => array($config_entity => $machine_name),
        'weight' => 5,
      );
    }
  }
.
.
.
}

The problem is the following: with field_collection, the delete form route is not called "entity.field_collection.delete_form" but "entity.field_collection_item.delete_form" (see my comment in the code)
I don't know if this is a FC problem or an ADMIN_TOOL problem

There is another problem with this chunk of code: the parent of those links is wrongly attributed. The result is a lot of links added at the root of the admin menu (invisible in the UI), the parent should be "Structure > Field Collections"