Pane Region wrappers is still showing even when there is not blocks content to show

I added a block to a region using page manager UI, this block in some pages rendered with this layout has content and in others not, depending of that on my twig template I decide if I render this region with S css class or Y css class. But the regions is coming is always not empty no matters if the only block is empty or not. I checked the panels code and I found

https://cgit.drupalcode.org/panels/tree/src/Plugin/DisplayBuilder/Standa...

 protected function buildRegions(array $regions, array $contexts) {
    $build = [];
    foreach ($regions as $region => $blocks) {
      if (!$blocks) {
        continue;
      }

      $region_name = Html::getClass("block-region-$region");
      $build[$region]['#prefix'] = '<div class="' . $region_name . '">';
      $build[$region]['#suffix'] = '</div>';

this method ALWAYS add the wrapper no matters if is added or not any content to the region.