diff --git a/features/language-core.feature b/features/language-core.feature
index ecab9c70..141f2c93 100644
--- a/features/language-core.feature
+++ b/features/language-core.feature
@@ -225,9 +225,12 @@ Feature: Manage core translation files for a WordPress install
     Given an empty directory
     And WP files
     And a database
-    And I run `wp core download --version=<original> --force`
+    And I try `wp core download --version=<original> --force`
+    And the return code should be 0
     And wp-config.php
-    And I run `wp core install --url='localhost:8001' --title='Test' --admin_user=wpcli --admin_email=admin@example.com --admin_password=1`
+    # The SQLite object cache drop-in might produce a "no such table: wp_options" STDERR during installation.
+    And I try `wp core install --url='localhost:8001' --title='Test' --admin_user=wpcli --admin_email=admin@example.com --admin_password=1`
+    And the return code should be 0
 
     When I run `wp language core list --fields=language,status,update`
     Then STDOUT should be a table containing rows:
@@ -505,9 +508,12 @@ Feature: Manage core translation files for a WordPress install
     Given an empty directory
     And WP files
     And a database
-    And I run `wp core download --version=<original> --force`
+    And I try `wp core download --version=<original> --force`
+    And the return code should be 0
     And wp-config.php
-    And I run `wp core install --url='localhost:8001' --title='Test' --admin_user=wpcli --admin_email=admin@example.com --admin_password=1`
+    # The SQLite object cache drop-in might produce a "no such table: wp_options" STDERR during installation.
+    And I try `wp core install --url='localhost:8001' --title='Test' --admin_user=wpcli --admin_email=admin@example.com --admin_password=1`
+    And the return code should be 0
 
     When I run `wp language core install en_CA ja`
     Then STDERR should be empty
diff --git a/src/Core_Language_Command.php b/src/Core_Language_Command.php
index 16347599..25204657 100644
--- a/src/Core_Language_Command.php
+++ b/src/Core_Language_Command.php
@@ -370,10 +370,13 @@ public function uninstall( $args ) {
 				}
 
 				/** @var WP_Filesystem_Base $wp_filesystem */
-				$deleted = $wp_filesystem->delete( WP_LANG_DIR . $dir . '/' . $file );
+				if ( $wp_filesystem->delete( WP_LANG_DIR . $dir . '/' . $file ) ) {
+					$deleted = true;
+				}
 			}
 
 			if ( $deleted ) {
+				$this->clear_translation_files_cache( WP_LANG_DIR . $dir );
 				WP_CLI::success( 'Language uninstalled.' );
 			} else {
 				WP_CLI::error( "Couldn't uninstall language." );
diff --git a/src/Plugin_Language_Command.php b/src/Plugin_Language_Command.php
index e6f10d3e..dd47d74a 100644
--- a/src/Plugin_Language_Command.php
+++ b/src/Plugin_Language_Command.php
@@ -551,11 +551,13 @@ public function uninstall( $args, $assoc_args ) {
 				if ( $count_files_to_remove === $count_files_removed ) {
 					$result['status'] = 'uninstalled';
 					++$successes;
+					$this->clear_translation_files_cache( $dir );
 					\WP_CLI::log( "Language '{$language_code}' for '{$plugin}' uninstalled." );
 				} elseif ( $count_files_removed ) {
 					\WP_CLI::log( "Language '{$language_code}' for '{$plugin}' partially uninstalled." );
 					$result['status'] = 'partial uninstall';
 					++$errors;
+					$this->clear_translation_files_cache( $dir );
 				} elseif ( $had_one_file ) { /* $count_files_removed == 0 */
 						\WP_CLI::log( "Couldn't uninstall language '{$language_code}' from plugin {$plugin}." );
 						$result['status'] = 'failed to uninstall';
diff --git a/src/Theme_Language_Command.php b/src/Theme_Language_Command.php
index 7e5bce13..dd790438 100644
--- a/src/Theme_Language_Command.php
+++ b/src/Theme_Language_Command.php
@@ -570,11 +570,13 @@ public function uninstall( $args, $assoc_args ) {
 				if ( $count_files_to_remove === $count_files_removed ) {
 					$result['status'] = 'uninstalled';
 					++$successes;
+					$this->clear_translation_files_cache( $dir );
 					\WP_CLI::log( "Language '{$language_code}' for '{$theme}' uninstalled." );
 				} elseif ( $count_files_removed ) {
 					\WP_CLI::log( "Language '{$language_code}' for '{$theme}' partially uninstalled." );
 					$result['status'] = 'partial uninstall';
 					++$errors;
+					$this->clear_translation_files_cache( $dir );
 				} elseif ( $had_one_file ) { /* $count_files_removed == 0 */
 						\WP_CLI::log( "Couldn't uninstall language '{$language_code}' from theme {$theme}." );
 						$result['status'] = 'failed to uninstall';
diff --git a/src/WP_CLI/CommandWithTranslation.php b/src/WP_CLI/CommandWithTranslation.php
index dc2d1da3..b0efeccb 100644
--- a/src/WP_CLI/CommandWithTranslation.php
+++ b/src/WP_CLI/CommandWithTranslation.php
@@ -439,4 +439,16 @@ protected function get_all_languages( $slug = null ) {
 	protected function get_formatter( &$assoc_args ) {
 		return new Formatter( $assoc_args, $this->obj_fields, $this->obj_type );
 	}
+
+	/**
+	 * Clears the translation files cache for a given directory.
+	 *
+	 * As of WP 6.5, the presence of .mo and .l10n.php files is cached.
+	 *
+	 * @param string $dir The directory to clear the cache for.
+	 */
+	protected function clear_translation_files_cache( $dir ) {
+		$path = rtrim( $dir, '/' ) . '/';
+		wp_cache_delete( md5( $path ), 'translation_files' );
+	}
 }