diff --git a/wp-includes/class-wp-textdomain-registry.php b/wp-includes/class-wp-textdomain-registry.php
index f0c8b8ded7..4121ecb091 100644
--- a/wp-includes/class-wp-textdomain-registry.php
+++ b/wp-includes/class-wp-textdomain-registry.php
@@ -161,7 +161,7 @@ class WP_Textdomain_Registry {
 	 * @return array Array of .mo file paths.
 	 */
 	public function get_language_files_from_path( $path ) {
-		$path = trailingslashit( $path );
+		$path = rtrim( $path, '/' ) . '/';
 
 		/**
 		 * Filters the .mo files retrieved from a specified path before the actual lookup.
@@ -237,13 +237,13 @@ class WP_Textdomain_Registry {
 		foreach ( $translation_types as $type ) {
 			switch ( $type ) {
 				case 'plugin':
-					wp_cache_delete( 'cached_mo_files_' . md5( trailingslashit( WP_LANG_DIR ) . '/plugins/' ), 'translations' );
+					wp_cache_delete( 'cached_mo_files_' . md5( WP_LANG_DIR . '/plugins' ), 'translations' );
 					break;
 				case 'theme':
-					wp_cache_delete( 'cached_mo_files_' . md5( trailingslashit( WP_LANG_DIR ) . '/themes/' ), 'translations' );
+					wp_cache_delete( 'cached_mo_files_' . md5( WP_LANG_DIR . '/themes' ), 'translations' );
 					break;
 				default:
-					wp_cache_delete( 'cached_mo_files_' . md5( trailingslashit( WP_LANG_DIR ) ), 'translations' );
+					wp_cache_delete( 'cached_mo_files_' . md5( WP_LANG_DIR ), 'translations' );
 					break;
 			}
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5d29cba379..17aca06579 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57289';
+$wp_version = '6.5-alpha-57290';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.