diff --git a/wp-admin/includes/admin.php b/wp-admin/includes/admin.php
index c2c1890ec8..ce2ec0c68b 100644
--- a/wp-admin/includes/admin.php
+++ b/wp-admin/includes/admin.php
@@ -13,7 +13,9 @@ if ( ! defined( 'WP_ADMIN' ) ) {
 	 * some setup was skipped. Make sure the admin message catalog is loaded since
 	 * load_default_textdomain() will not have done so in this context.
 	 */
-	load_textdomain( 'default', WP_LANG_DIR . '/admin-' . get_locale() . '.mo' );
+	$admin_locale = get_locale();
+	load_textdomain( 'default', WP_LANG_DIR . '/admin-' . $admin_locale . '.mo', $admin_locale );
+	unset( $admin_locale );
 }
 
 /** WordPress Administration Hooks */
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 563c4d78b8..c14a7c4a7d 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -6347,7 +6347,7 @@ function wp_timezone_choice( $selected_zone, $locale = null ) {
 		$locale_loaded = $locale ? $locale : get_locale();
 		$mofile        = WP_LANG_DIR . '/continents-cities-' . $locale_loaded . '.mo';
 		unload_textdomain( 'continents-cities' );
-		load_textdomain( 'continents-cities', $mofile );
+		load_textdomain( 'continents-cities', $mofile, $locale_loaded );
 		$mo_loaded = true;
 	}
 
diff --git a/wp-includes/load.php b/wp-includes/load.php
index 4986603e9e..bb0db65b94 100644
--- a/wp-includes/load.php
+++ b/wp-includes/load.php
@@ -1392,9 +1392,9 @@ function wp_load_translations_early() {
 		foreach ( $locales as $locale ) {
 			foreach ( $locations as $location ) {
 				if ( file_exists( $location . '/' . $locale . '.mo' ) ) {
-					load_textdomain( 'default', $location . '/' . $locale . '.mo' );
+					load_textdomain( 'default', $location . '/' . $locale . '.mo', $locale );
 					if ( defined( 'WP_SETUP_CONFIG' ) && file_exists( $location . '/admin-' . $locale . '.mo' ) ) {
-						load_textdomain( 'default', $location . '/admin-' . $locale . '.mo' );
+						load_textdomain( 'default', $location . '/admin-' . $locale . '.mo', $locale );
 					}
 					break 2;
 				}
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php
index 954165b825..43e6676eff 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php
@@ -336,7 +336,7 @@ class WP_REST_Site_Health_Controller extends WP_REST_Controller {
 		// Accounts for inner REST API requests in the admin.
 		if ( ! is_admin() ) {
 			$locale = determine_locale();
-			load_textdomain( 'default', WP_LANG_DIR . "/admin-$locale.mo" );
+			load_textdomain( 'default', WP_LANG_DIR . "/admin-$locale.mo", $locale );
 		}
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index e8720c149c..38ebdbeb13 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1.1-alpha-54796';
+$wp_version = '6.1.1-alpha-54798';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.