diff --git a/core/includes/common.inc b/core/includes/common.inc
index 8357938..880d7f8 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -541,22 +541,8 @@ function drupal_merge_attached(array $a, array $b) {
  *   When attaching something of a non-existing attachment type.
  */
 function drupal_process_attached(array $elements) {
-  // If there is something to set, we should set it.
-  if (!empty($elements['#attached'])) {
-    // We merge the attachments with a static on
-    // HtmlResponseAttachmentsProcessor. If that property is empty, we have to
-    // set it first.
-    if (empty(HtmlResponseAttachmentsProcessor::$legacyAttached)) {
-      HtmlResponseAttachmentsProcessor::$legacyAttached = $elements['#attached'];
-    }
-    else {
-      HtmlResponseAttachmentsProcessor::$legacyAttached =
-        BubbleableMetadata::mergeAttachments(
-          HtmlResponseAttachmentsProcessor::$legacyAttached,
-          $elements['#attached']
-        );
-    }
-  }
+  $build['#attached'] = $elements['#attached'];
+  \Drupal::service('renderer')->render($build);
 }
 
 /**
diff --git a/core/lib/Drupal/Core/Render/HtmlResponseAttachmentsProcessor.php b/core/lib/Drupal/Core/Render/HtmlResponseAttachmentsProcessor.php
index 0b001c7..6104b0a 100644
--- a/core/lib/Drupal/Core/Render/HtmlResponseAttachmentsProcessor.php
+++ b/core/lib/Drupal/Core/Render/HtmlResponseAttachmentsProcessor.php
@@ -37,15 +37,6 @@
 class HtmlResponseAttachmentsProcessor implements AttachmentsResponseProcessorInterface {
 
   /**
-   * An ['#attached'] array.
-   *
-   * Provided so that we can support drupal_processed_attached() as an API.
-   *
-   * @var array
-   */
-  public static $legacyAttached;
-
-  /**
    * The asset resolver service.
    *
    * @var \Drupal\Core\Asset\AssetResolverInterface
@@ -148,10 +139,6 @@ public function processAttachments(AttachmentsInterface $response) {
       return $e->getResponse();
     }
 
-    // Add the static attachment array to preserve drupal_process_attached().
-    if (!empty(static::$legacyAttached)) {
-      $response->addAttachments(static::$legacyAttached);
-    }
     // Get a reference to the attachments.
     $attached = $response->getAttachments();