diff --git a/core/includes/batch.inc b/core/includes/batch.inc
index 7d905cd..a5d6242 100644
--- a/core/includes/batch.inc
+++ b/core/includes/batch.inc
@@ -135,9 +135,11 @@ function _batch_progress_page() {
     // additional HTML output by PHP shows up inside the page rather than below
     // it. While this causes invalid HTML, the same would be true if we didn't,
     // as content is not allowed to appear after </html> anyway.
-    $fallback = \Drupal::service('bare_html_page_renderer')->renderBarePage(['#markup' => $fallback], $current_set['title'], 'maintenance_page', array(
+    $bare_html_page_renderer = \Drupal::service('bare_html_page_renderer');
+    $content = $bare_html_page_renderer->renderBarePage(['#markup' => $fallback], $current_set['title'], 'maintenance_page', array(
       '#show_messages' => FALSE,
     ));
+    $fallback = $bare_html_page_renderer->filterRenderArray($content);
     list($fallback) = explode('<!--partial-->', $fallback);
     print $fallback;
 
diff --git a/core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php b/core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php
index 91b5288..ae2fb42 100644
--- a/core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php
+++ b/core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php
@@ -83,4 +83,14 @@ public function filterResponse(AttachmentsResponseInterface $response) {
     FinishResponseSubscriber::processAttachments($response);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function filterRenderArray(array $build) {
+    $response = new CacheableHtmlResponse($build);
+    FinishResponseSubscriber::processAttachments($response);
+    return $response->getContent();
+  }
+
+
 }