Ticket #35657: 35657.2.diff

src/wp-includes/js/wp-embed-template.js

@@ -138 +138 @@
                  */
                 sendEmbedMessage( 'height', Math.ceil( document.body.getBoundingClientRect().height ) );
 
+                // Send the document's height again after the featured image has been loaded.
+                document.querySelector( '.wp-embed-featured-image img' ).addEventListener( 'load', function() {
+                        sendEmbedMessage( 'height', Math.ceil( document.body.getBoundingClientRect().height ) );
+                } );
+
                 /**
                  * Detect clicks to external (_top) links.
                  */