Ticket #39521: 39521.diff

src/wp-admin/includes/media.php

@@ -435 +435 @@
                 'post_parent' => $post_id,
                 'post_title' => $title,
                 'post_content' => $content,
+                'post_excerpt' => $excerpt,
         ), $post_data );
 
         // This should never be set as it would then overwrite an existing attachment.