diff --git a/core/includes/pager.inc b/core/includes/pager.inc
index eb97a5c..b358ac6 100644
--- a/core/includes/pager.inc
+++ b/core/includes/pager.inc
@@ -277,6 +277,10 @@ function template_preprocess_pager(&$variables) {
   }
 
   $variables['items'] = $items;
+
+  // This is is based on the entire current query string. We need to ensure
+  // cacheability is affected accordingly.
+  $variables['#cache'] = ['contexts' => ['url.query_args']];
 }
 
 /**
@@ -313,11 +317,6 @@ function pager_query_add_page(array $query, $element, $index) {
     $query = array_merge($current_request_query, $query);
   }
 
-  // This is is based on the entire current query string. We need to ensure
-  // cacheability is affected accordingly.
-  $build = ['#cache' => ['contexts' => ['url.query_args']]];
-  \Drupal::service('renderer')->render($build);
-
   return $query;
 }
 
diff --git a/core/lib/Drupal/Core/Render/Element/FormElement.php b/core/lib/Drupal/Core/Render/Element/FormElement.php
index d1d2bed..fa4cec3 100644
--- a/core/lib/Drupal/Core/Render/Element/FormElement.php
+++ b/core/lib/Drupal/Core/Render/Element/FormElement.php
@@ -131,7 +131,7 @@ public static function processAutocomplete(&$element, FormStateInterface $form_s
       $element['#attributes']['data-autocomplete-path'] = $url->getGeneratedUrl();
       CacheableMetadata::createFromRenderArray($element)
         ->merge($url)
-        ->merge($access)
+        ->merge(CacheableMetadata::createFromObject($access))
         ->applyTo($element);
     }
 
diff --git a/core/lib/Drupal/Core/Theme/ThemeManager.php b/core/lib/Drupal/Core/Theme/ThemeManager.php
index 3f7ffae..404f2ca 100644
--- a/core/lib/Drupal/Core/Theme/ThemeManager.php
+++ b/core/lib/Drupal/Core/Theme/ThemeManager.php
@@ -302,14 +302,20 @@ protected function theme($hook, $variables = array()) {
           $preprocessor_function($variables, $hook, $info);
         }
       }
-      // Allow theme preprocess functions to set $variables['#attached'] and use
-      // it like the #attached property on render arrays. In Drupal 8, this is
-      // the (only) officially supported method of attaching assets from
-      // preprocess functions. Assets attached here should be associated with
-      // the template that we're preprocessing variables for.
-      if (isset($variables['#attached'])) {
-        $preprocess_attached = ['#attached' => $variables['#attached']];
-        drupal_render($preprocess_attached);
+      // Allow theme preprocess functions to set $variables['#attached'] and
+      // $variables['#cached'] and use them like the corresponding element
+      // properties on render arrays. In Drupal 8, this is the (only) officially
+      // supported method of attaching bubbleable metadata from preprocess
+      // functions. Assets attached here should be associated with the template
+      // that we are preprocessing variables for.
+      $preprocess_bubbleable = [];
+      foreach (['#attached', '#cache'] as $key) {
+        if (isset($variables[$key])) {
+          $preprocess_bubbleable[$key] = $variables[$key];
+        }
+      }
+      if ($preprocess_bubbleable) {
+        drupal_render($preprocess_bubbleable);
       }
     }
 
diff --git a/core/modules/system/src/Tests/Pager/PagerTest.php b/core/modules/system/src/Tests/Pager/PagerTest.php
index dc643a5..7ea07fb 100644
--- a/core/modules/system/src/Tests/Pager/PagerTest.php
+++ b/core/modules/system/src/Tests/Pager/PagerTest.php
@@ -72,7 +72,7 @@ function testActiveClass() {
   /**
    * Test proper functioning of the query parameters and the pager cache context.
    */
-  protected function testPagerQueryParametersAndCacheContext() {
+  public function testPagerQueryParametersAndCacheContext() {
     // First page.
     $this->drupalGet('pager-test/query-parameters');
     $this->assertText(t('Pager calls: 0'), 'Initial call to pager shows 0 calls.');
diff --git a/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
index 3ae454b..528b53a 100644
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -1050,6 +1050,10 @@ function template_preprocess_views_mini_pager(&$variables) {
     }
     $variables['items']['next']['attributes'] = new Attribute();
   }
+
+  // This is is based on the entire current query string. We need to ensure
+  // cacheability is affected accordingly.
+  $variables['#cache'] = ['contexts' => ['url.query_args']];
 }
 
 /**