Ticket #35102: 35102.diff

src/wp-includes/media.php

@@ -1296 +1296 @@
         $all_sizes[] = $base_url . $image_meta['file'];
 
         // Bail early if the image src doesn't match any of the known image sizes.
-        if ( ! in_array( $image_src, $all_sizes ) ) {
+        if ( ! in_array( $image_src, $all_sizes ) && ! apply_filters( 'known_image_src_in_image_sizes', false, $image_src, $image_meta, $attachment_id )) {
                 return $image;
         }