Update src/Plugin/Block/FacetBlock.php

Closes #3298956

src/Plugin/Block/FacetBlock.php

@@ -89,6 +89,11 @@ class FacetBlock extends BlockBase implements ContainerFactoryPluginInterface {
 
     // Let the facet_manager build the facets.
     $build = $this->facetManager->build($facet);
+    if ($this->inPreview && in_array('facet-hidden', $build[0]["#attributes"]["class"])) {
+      // Layout Builder UI will not show facet block with 'facet-hidden'
+      // attribute unless we return empty array here.
+      return [];
+    }
 
     if (!empty($build)) {
       CacheableMetadata::createFromObject($this)->applyTo($build);