diff --git a/wp-includes/class-wp-customize-manager.php b/wp-includes/class-wp-customize-manager.php
index 4f8aae8fbd..77176609bc 100644
--- a/wp-includes/class-wp-customize-manager.php
+++ b/wp-includes/class-wp-customize-manager.php
@@ -1909,6 +1909,7 @@ final class WP_Customize_Manager {
 		if ( ! headers_sent() ) {
 			nocache_headers();
 			header( 'X-Robots: noindex, nofollow, noarchive' );
+			header( 'X-Robots-Tag: noindex, nofollow, noarchive' );
 		}
 		add_filter( 'wp_robots', 'wp_robots_no_robots' );
 		add_filter( 'wp_headers', array( $this, 'filter_iframe_security_headers' ) );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 719ab8b74d..9ea54c11f4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56461';
+$wp_version = '6.4-alpha-56462';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.