diff --git a/wp-admin/includes/class-wp-site-health.php b/wp-admin/includes/class-wp-site-health.php
index a198b496d7..eda8bfaa4b 100644
--- a/wp-admin/includes/class-wp-site-health.php
+++ b/wp-admin/includes/class-wp-site-health.php
@@ -2009,9 +2009,19 @@ class WP_Site_Health {
 			'test'        => 'update_temp_backup_writable',
 		);
 
-		if ( ! $wp_filesystem ) {
+		if ( ! function_exists( 'WP_Filesystem' ) ) {
 			require_once ABSPATH . '/wp-admin/includes/file.php';
-			WP_Filesystem();
+		}
+
+		ob_start();
+		$credentials = request_filesystem_credentials( '' );
+		ob_end_clean();
+
+		if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {
+			$result['status']      = 'recommended';
+			$result['label']       = __( 'Could not access filesystem' );
+			$result['description'] = __( 'Unable to connect to the filesystem. Please confirm your credentials.' );
+			return $result;
 		}
 
 		$wp_content = $wp_filesystem->wp_content_dir();
diff --git a/wp-includes/update.php b/wp-includes/update.php
index 350182b2ce..7c4e31feef 100644
--- a/wp-includes/update.php
+++ b/wp-includes/update.php
@@ -1113,9 +1113,16 @@ function wp_delete_all_temp_backups() {
 function _wp_delete_all_temp_backups() {
 	global $wp_filesystem;
 
-	if ( ! $wp_filesystem ) {
+	if ( ! function_exists( 'WP_Filesystem' ) ) {
 		require_once ABSPATH . '/wp-admin/includes/file.php';
-		WP_Filesystem();
+	}
+
+	ob_start();
+	$credentials = request_filesystem_credentials( '' );
+	ob_end_clean();
+
+	if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {
+		return new WP_Error( 'fs_unavailable', __( 'Could not access filesystem.' ) );
 	}
 
 	if ( ! $wp_filesystem->wp_content_dir() ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 077bcb66ef..90f48edd15 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56339';
+$wp_version = '6.4-alpha-56341';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.