diff --git a/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php b/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php
index 13e5884..c4abe86 100644
--- a/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php
+++ b/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php
@@ -184,13 +184,13 @@ protected function prepare(array $main_content, Request $request, RouteMatchInte
       if (!empty($main_content)) {
 
         $this->renderer->executeInRenderContext(new RenderContext(), function() use (&$main_content) {
+          // Ensure that we at least store the page title in cache.
+          $main_content['#cache_properties'][] = '#title';
           return $this->renderer->render($main_content, FALSE);
         });
         $main_content = $this->renderCache->getCacheableRenderArray($main_content) + [
           '#title' => isset($main_content['#title']) ? $main_content['#title'] : NULL
         ];
-        // Ensure that we at least store the page title in cache.
-        $main_content['#cache_properties'][] = '#title';
       }
 
       // Instantiate the page display, and give it the main content.
diff --git a/core/modules/system/src/Tests/System/PageTitleTest.php b/core/modules/system/src/Tests/System/PageTitleTest.php
index b91b2b4..9dea747 100644
--- a/core/modules/system/src/Tests/System/PageTitleTest.php
+++ b/core/modules/system/src/Tests/System/PageTitleTest.php
@@ -43,7 +43,7 @@ protected function setUp() {
   /**
    * Tests the handling of HTML in node titles.
    */
-  function ptestTitleTags() {
+  function testTitleTags() {
     $title = "string with <em>HTML</em>";
     // Generate node content.
     $edit = array(
@@ -62,7 +62,7 @@ function ptestTitleTags() {
   /**
    * Test if the title of the site is XSS proof.
    */
-  function ptestTitleXSS() {
+  function testTitleXSS() {
     // Set some title with JavaScript and HTML chars to escape.
     $title = '</title><script type="text/javascript">alert("Title XSS!");</script> & < > " \' ';
     $title_filtered = SafeMarkup::checkPlain($title);