diff --git a/wp-content/themes/twentytwentyone/inc/menu-functions.php b/wp-content/themes/twentytwentyone/inc/menu-functions.php
index d8d2aae36c..5c14b96a35 100644
--- a/wp-content/themes/twentytwentyone/inc/menu-functions.php
+++ b/wp-content/themes/twentytwentyone/inc/menu-functions.php
@@ -25,7 +25,9 @@
  * @return string Nav menu item start element.
  */
 function twenty_twenty_one_add_sub_menu_toggle( $output, $item, $depth, $args ) {
-	if ( 0 === $depth && in_array( 'menu-item-has-children', $item->classes, true ) ) {
+	if ( 'primary' === $args->theme_location
+		&& 0 === $depth && in_array( 'menu-item-has-children', $item->classes, true )
+	) {
 
 		// Add toggle button.
 		$output .= '<button class="sub-menu-toggle" aria-expanded="false" onClick="twentytwentyoneExpandSubMenu(this)">';
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3ade8f33e9..51f49c4b8e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-58292';
+$wp_version = '6.6-alpha-58293';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.