diff --git a/core/lib/Drupal/Core/Render/Renderer.php b/core/lib/Drupal/Core/Render/Renderer.php
index 0bf1d63..2ff7c8b 100644
--- a/core/lib/Drupal/Core/Render/Renderer.php
+++ b/core/lib/Drupal/Core/Render/Renderer.php
@@ -209,6 +209,19 @@ protected function doRender(&$elements, $is_root_call = FALSE) {
       return '';
     }
 
+    // Render only the children if the #render_children property is set.
+    if (isset($elements['#render_children'])) {
+      $children = Element::children($elements);
+
+      if (empty($children)) {
+        return '';
+      }
+
+      // It is okay to modify the original elements for this, because this will
+      // be called from a twig template, where the variable is passed by value.
+      $elements = array_intersect_key($elements, array_flip($children));
+    }
+
     if (!isset($elements['#access']) && isset($elements['#access_callback'])) {
       if (is_string($elements['#access_callback']) && strpos($elements['#access_callback'], '::') === FALSE) {
         $elements['#access_callback'] = $this->controllerResolver->getControllerFromDefinition($elements['#access_callback']);
@@ -428,10 +441,8 @@ protected function doRender(&$elements, $is_root_call = FALSE) {
     }
 
     // Call the element's #theme function if it is set. Then any children of the
-    // element have to be rendered there. If the internal #render_children
-    // property is set, do not call the #theme function to prevent infinite
-    // recursion.
-    if ($theme_is_implemented && !isset($elements['#render_children'])) {
+    // element have to be rendered there.
+    if ($theme_is_implemented) {
       $elements['#children'] = $this->theme->render($elements['#theme'], $elements);
 
       // If ThemeManagerInterface::render() returns FALSE this means that the
@@ -440,10 +451,10 @@ protected function doRender(&$elements, $is_root_call = FALSE) {
       $theme_is_implemented = ($elements['#children'] !== FALSE);
     }
 
-    // If #theme is not implemented or #render_children is set and the element
-    // has an empty #children attribute, render the children now. This is the
-    // same process as Renderer::render() but is inlined for speed.
-    if ((!$theme_is_implemented || isset($elements['#render_children'])) && empty($elements['#children'])) {
+    // If #theme is not implemented and the element has an empty #children
+    // attribute, render the children now. This is the same process as
+    // Renderer::render() but is inlined for speed.
+    if (!$theme_is_implemented && empty($elements['#children'])) {
       foreach ($children as $key) {
         $elements['#children'] .= $this->doRender($elements[$key]);
       }
@@ -467,9 +478,7 @@ protected function doRender(&$elements, $is_root_call = FALSE) {
     // because the #type 'page' render array from drupal_prepare_page() would
     // render the $page and wrap it into the html.html.twig template without the
     // attached assets otherwise.
-    // If the internal #render_children property is set, do not call the
-    // #theme_wrappers function(s) to prevent infinite recursion.
-    if (isset($elements['#theme_wrappers']) && !isset($elements['#render_children'])) {
+    if (isset($elements['#theme_wrappers'])) {
       foreach ($elements['#theme_wrappers'] as $key => $value) {
         // If the value of a #theme_wrappers item is an array then the theme
         // hook is found in the key of the item and the value contains attribute