diff --git a/core/authorize.php b/core/authorize.php
index dbab02f..76d4c7b 100644
--- a/core/authorize.php
+++ b/core/authorize.php
@@ -116,10 +116,14 @@ function authorize_access_allowed() {
       $links += $results['tasks'];
     }
     else {
-      $links = array_merge($links, array(
-        \Drupal::l(t('Administration pages'), new Url('system.admin')),
-        \Drupal::l(t('Front page'), new Url('<front>')),
-      ));
+      $front_url = Url::fromRoute('<front>')
+                      ->setOption('base_url', $GLOBALS['base_url']);
+      $admin_url = Url::fromRoute('system.admin')
+                      ->setOption('base_url', $GLOBALS['base_url']);
+      $links = array_merge($links, [
+        ['#markup' => \Drupal::l(t('Administration pages'), $admin_url)],
+        ['#markup' => \Drupal::l(t('Front page'), $front_url)],
+      ]);
     }
 
     $content['next_steps'] = array(
diff --git a/core/includes/theme.maintenance.inc b/core/includes/theme.maintenance.inc
index ecf48cf..6f9cc6b 100644
--- a/core/includes/theme.maintenance.inc
+++ b/core/includes/theme.maintenance.inc
@@ -128,7 +128,7 @@ function template_preprocess_authorize_report(&$variables) {
         $class = 'authorize-results__' . ($log_message['success'] ? 'success' : 'failure');
         $items[] = [
           '#wrapper_attributes' => ['class' => [$class]],
-          '#markup' => $message,
+          '#markup' => $log_message['message'],
         ];
       }
       $variables['report'][] = [
diff --git a/core/lib/Drupal/Core/Theme/Registry.php b/core/lib/Drupal/Core/Theme/Registry.php
index 805c9a9..04619a2 100644
--- a/core/lib/Drupal/Core/Theme/Registry.php
+++ b/core/lib/Drupal/Core/Theme/Registry.php
@@ -424,6 +424,13 @@ protected function processExtension(&$cache, $name, $type, $theme, $path) {
           $result[$hook]['includes'] = $cache[$hook]['includes'];
         }
 
+        // Load the includes, as they may contain preprocess functions.
+        if (isset($info['includes'])) {
+          foreach ($info['includes'] as $include_file) {
+            include_once $this->root . '/' . $include_file;
+          }
+        }
+
         // If the theme implementation defines a file, then also use the path
         // that it defined. Otherwise use the default path. This allows
         // system.module to declare theme functions on behalf of core .include
diff --git a/core/lib/Drupal/Core/Updater/Module.php b/core/lib/Drupal/Core/Updater/Module.php
index 06e1c1e..9e6c396 100644
--- a/core/lib/Drupal/Core/Updater/Module.php
+++ b/core/lib/Drupal/Core/Updater/Module.php
@@ -99,11 +99,17 @@ public function getSchemaUpdates() {
    * Overrides Drupal\Core\Updater\Updater::postInstallTasks().
    */
   public function postInstallTasks() {
-    return array(
-      \Drupal::l(t('Install another module'), new Url('update.module_install')),
-      \Drupal::l(t('Enable newly added modules'), new Url('system.modules_list')),
-      \Drupal::l(t('Administration pages'), new Url('system.admin')),
-    );
+    $admin_url = Url::fromRoute('system.admin')
+                    ->setOption('base_url', $GLOBALS['base_url']);
+    $list_url = Url::fromRoute('system.modules_list')
+                   ->setOption('base_url', $GLOBALS['base_url']);
+    $install_url = Url::fromRoute('update.module_install')
+                      ->setOption('base_url', $GLOBALS['base_url']);
+    return [
+      ['#markup' => \Drupal::l(t('Install another module'), $install_url)],
+      ['#markup' => \Drupal::l(t('Enable newly added modules'), $list_url)],
+      ['#markup' => \Drupal::l(t('Administration pages'), $admin_url)],
+    ];
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Updater/Theme.php b/core/lib/Drupal/Core/Updater/Theme.php
index b379325..5d38475 100644
--- a/core/lib/Drupal/Core/Updater/Theme.php
+++ b/core/lib/Drupal/Core/Updater/Theme.php
@@ -83,9 +83,13 @@ public function postInstall() {
    * Overrides Drupal\Core\Updater\Updater::postInstallTasks().
    */
   public function postInstallTasks() {
-    return array(
-      \Drupal::l(t('Install newly added themes'), new Url('system.themes_page')),
-      \Drupal::l(t('Administration pages'), new Url('system.admin')),
-    );
+    $theme_page_url = Url::fromRoute('system.themes_page')
+                         ->setOption('base_url', $GLOBALS['base_url']);
+    $admin_url = Url::fromRoute('system.admin')
+                    ->setOption('base_url', $GLOBALS['base_url']);
+    return [
+      ['#markup' => \Drupal::l(t('Install newly added themes'), $theme_page_url)],
+      ['#markup' => \Drupal::l(t('Administration pages'), $admin_url)],
+    ];
   }
 }