Ticket #39759: updated-39759.patch

embed-content.php

@@ -21 +21 @@
                 if ( 'attachment' === get_post_type() && wp_attachment_is_image() ) {
                         $thumbnail_id = get_the_ID();
                 }
-
+        /**
+         * Added filter for the embed_thumbnail_id
+         */
+        $thumbnail_id = apply_filters( 'embed_thumbnail_id', $thumbnail_id );
                 if ( $thumbnail_id ) {
                         $aspect_ratio = 1;
                         $measurements = array( 1, 1 );