.../Core/EventSubscriber/EarlyRenderingControllerWrapper.php     | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapper.php b/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapper.php
index a39c261..125ba49 100644
--- a/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapper.php
+++ b/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapper.php
@@ -7,7 +7,9 @@
 
 namespace Drupal\Core\EventSubscriber;
 
+use Drupal\Core\Cache\CacheableDependencyInterface;
 use Drupal\Core\Controller\ControllerResolverInterface;
+use Drupal\Core\Render\AttachmentsInterface;
 use Drupal\Core\Render\BubbleableMetadata;
 use Drupal\Core\Render\RenderContext;
 use Drupal\Core\Render\RendererInterface;
@@ -115,7 +117,12 @@ public function onController(FilterControllerEvent $event) {
             ->merge($early_rendering_bubbleable_metadata)
             ->applyTo($response);
         }
-        else {
+        // If early rendering happened, yet a response object is returned, not a
+        // render array, and the response object cares about attachments or
+        // cacheability, then throw an exception: early rendering is not
+        // permitted in that case. It is the developer's responsibility to not
+        // use early rendering.
+        elseif ($response instanceof AttachmentsInterface || $response instanceof CacheableDependencyInterface) {
           throw new \LogicException(sprintf('Early rendering is not permitted for controllers returning anything else than render arrays. Response class: %s.', get_class($response)));
         }
       }