Ticket #50711: 50711.diff

src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php

@@ -581 +581 @@
                         update_post_meta( $new_attachment_id, '_wp_attachment_image_alt', wp_slash( $image_alt ) );
                 }
 
+                if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
+                        // Set a custom header with the attachment_id.
+                        // Used by the browser/client to resume creating image sub-sizes after a PHP fatal error.
+                        header( 'X-WP-Upload-Attachment-ID: ' . $new_attachment_id );
+                }
+
                 // Generate image sub-sizes and meta.
                 $new_image_meta = wp_generate_attachment_metadata( $new_attachment_id, $saved['path'] );