Issue 3365166: Prevent facets items being run twice through...

Issue 3365166: Prevent facets items being run twice through template_preprocess_item_list() + fix missing title.

Closes #3365166

modules/facets_searchbox_widget/templates/facets-item-list--searchbox-checkbox.html.twig

@@ -24,6 +24,20 @@
  * @ingroup themeable
  */
 #}
+{% if cache_hash %}
+  <!-- facets cacheable metadata
+    hash: {{ cache_hash }}
+  {% if cache_contexts %}
+    contexts: {{ cache_contexts }}
+  {%- endif %}
+  {% if cache_tags %}
+    tags: {{ cache_tags }}
+  {%- endif %}
+  {% if cache_max_age %}
+    max age: {{ cache_max_age }}
+  {%- endif %}
+  -->
+{%- endif %}
 <div class="facets-widget- {{- facet.widget.type -}} ">
   <input type="text" placeholder="{{ 'Search...'|t }}" class="facets-widget-searchbox" data-type="checkbox" />
   {% if facet.widget.type %}