Issue #3342122 by mastap, smustgrave: /node/{id} not working for 404 exclusion

Closes #3342122

src/EventSubscriber/CacheexcludeSubscriber.php

@@ -107,6 +107,17 @@ class CacheexcludeSubscriber implements EventSubscriberInterface {
       if ($path_matches || $alias_path_matches) {
         return TRUE;
       }
+
+      $system404 = $this->configFactory->get('system.site')->get('page.404');
+
+      if (isset($system404)) {
+        if (is_array($pages) && in_array($current_path, $pages)) {
+          return TRUE;
+        }
+        elseif ($system404 === $pages) {
+          return TRUE;
+        }
+      }
     }
 
     return FALSE;