Cached panes missing css and js

Out of band data (css, js, head) is not cached with pane-specific caching.

Display renderer takes a snapshot of existing data (with panels_cache_object constructor) after rendering pane content:

$content = ctools_content_render($pane->type, $pane->subtype, $pane->configuration, array(), $this->display->args, $this->display->context);
 	
foreach (module_implements('panels_pane_content_alter') as $module) {
  $function = $module . '_panels_pane_content_alter';
  $function($content, $pane, $this->display->args, $this->display->context);
}
if ($caching) {
  $cache = new panels_cache_object();
  $cache->set_content($content);
  panels_set_cached_content($cache, $this->display, $this->display->args, $this->display->context, $pane);
  $content = $cache->content;
}

Moving $cache = new panels_cache_object(); above $content = ctools_content_render(..); seems to fix this.