diff --git a/core/modules/field_ui/src/Element/FieldUiTable.php b/core/modules/field_ui/src/Element/FieldUiTable.php
index 15dea19..edb6cdd 100644
--- a/core/modules/field_ui/src/Element/FieldUiTable.php
+++ b/core/modules/field_ui/src/Element/FieldUiTable.php
@@ -8,6 +8,7 @@
 namespace Drupal\field_ui\Element;
 
 use Drupal\Component\Utility\Html;
+use Drupal\Core\Render\Element;
 use Drupal\Core\Render\Element\Table;
 
 /**
@@ -25,11 +26,9 @@ public function getInfo() {
     $class = get_class($this);
     $parent_class = get_parent_class($this);
     $info = array(
-      '#regions' => ['' => []],
       // Render properties.
       '#pre_render' => [
         ['Drupal\field_ui\Form\EntityDisplayFormBase', 'tablePreRender'],
-        [$parent_class, 'preRenderTable'],
         [$class, 'preRenderTable'],
       ],
     ) + parent::getInfo();
@@ -79,7 +78,7 @@ public static function preRenderTable($element) {
 
         // Render children as table cells.
         foreach (Element::children($region_element) as $cell_key) {
-          $child = &$element[$cell_key];
+          $child = &$region_element[$cell_key];
           // Do not render a cell for children of #type 'value'.
           if (!(isset($child['#type']) && $child['#type'] == 'value')) {
             $cell = ['data' => drupal_render($child)];
@@ -92,6 +91,7 @@ public static function preRenderTable($element) {
         $element['#rows'][] = $row;
       }
     }
+    return $element;
   }
 
 }
diff --git a/core/modules/field_ui/src/Form/EntityDisplayFormBase.php b/core/modules/field_ui/src/Form/EntityDisplayFormBase.php
index 03574fa..d8258d8 100644
--- a/core/modules/field_ui/src/Form/EntityDisplayFormBase.php
+++ b/core/modules/field_ui/src/Form/EntityDisplayFormBase.php
@@ -807,7 +807,7 @@ public function tablePreRender($elements) {
     }
     // Determine rendering order from the tree structure.
     foreach ($regions as $region_name => $region) {
-      $elements['#regions'][$region_name]['rows_order'] = array_reduce($trees[$region_name], array($this, 'reduceOrder'));
+      $elements['#regions'][$region_name]['rows_order'] = array_reduce($trees[$region_name], array('Drupal\field_ui\Form\EntityDisplayFormBase', 'reduceOrder'));
     }
 
     $elements['#attached']['drupalSettings']['fieldUIRowsData'] = $js_settings;
@@ -838,7 +838,7 @@ public function reduceOrder($array, $a) {
     }
     if (!empty($a['children'])) {
       uasort($a['children'], array('Drupal\Component\Utility\SortArray', 'sortByWeightElement'));
-      $array = array_merge($array, array_reduce($a['children'], array($this, 'reduceOrder')));
+      $array = array_merge($array, array_reduce($a['children'], array('Drupal\field_ui\Form\EntityDisplayFormBase', 'reduceOrder')));
     }
     return $array;
   }