Ticket #39805: 39805.1.diff

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

@@ -1941 +1941 @@
                                         $schema['properties']['featured_media'] = array(
                                                 'description' => __( 'The ID of the featured media for the object.' ),
                                                 'type'        => 'integer',
-                                                'context'     => array( 'view', 'edit' ),
+                                                'context'     => array( 'view', 'edit', 'embed' ),
                                         );
                                         break;