diff --git a/includes/preprocess.inc b/includes/preprocess.inc
index e51d870..c93c991 100644
--- a/includes/preprocess.inc
+++ b/includes/preprocess.inc
@@ -15,6 +15,7 @@ use Drupal\Component\Utility\Html;
 use Drupal\Core\Template\Attribute;
 use Drupal\Core\Url;
 use Drupal\block\Entity\Block;
+use Drupal\Core\Render\Element;
 use Drupal\uikit\UIkit;
 
 /**
@@ -90,41 +91,31 @@ function uikit_preprocess_region(&$variables) {
     $variables['content_left'] = [];
     $variables['content_center'] = [];
     $variables['content_right'] = [];
+    $renderer = \Drupal::service('renderer');
 
-    foreach ($variables['elements'] as $id => $element) {
-      if (is_array($element)) {
-        $block = array();
+    foreach (Element::children($variables['elements']) as $id) {
+      $element = $variables['elements'][$id];
 
-        if (isset($element['#id'])) {
-          $block = Block::load($element['#id']);
-        }
-        elseif (isset($element['#markup'])) {
-          $block = Block::load($id);
-        }
-
-        if ($block) {
-          $navbar_alignment = $block->getThirdPartySetting('uikit_components', 'uikit_navbar_alignment', 'left');
+      $block = [];
 
-          switch ($navbar_alignment) {
-            case 'left':
-              $variables['content_left'][$id] = [
-                '#markup' => \Drupal::service('renderer')->render($element),
-              ];
-              break;
-
-            case 'center':
-              $variables['content_center'][$id] = [
-                '#markup' => \Drupal::service('renderer')->render($element),
-              ];
-              break;
+      if (isset($element['#id'])) {
+        $block = Block::load($element['#id']);
+      }
+      elseif (isset($element['#markup'])) {
+        $block = Block::load($id);
+      }
 
-            case 'right':
-              $variables['content_right'][$id] = [
-                '#markup' => \Drupal::service('renderer')->render($element),
-              ];
-              break;
-          }
-        }
+      if ($block) {
+        $navbar_alignment = $block->getThirdPartySetting('uikit_components', 'uikit_navbar_alignment', 'left');
+        $key = 'content_' . $navbar_alignment;
+        $variables[$key][$id] = [
+          '#markup' => isset($element['#markup']) ? $element['#markup'] : $renderer->render($element),
+          '#cache' => isset($element['#cache']) ? $element['#cache'] : [],
+          '#attached' => isset($element['#attached']) ? $element['#attached'] : [],
+        ];
+
+        // Leave a note where block has been moved to.
+        $variables['elements'][$id]['#placement'] = $key;
       }
     }
   }