Ticket #47299: class-wp-site-health.php.patch

src/wp-admin/includes/class-wp-site-health.php

@@ -612 +612 @@
                 }
 
                 // If not default Twenty* theme exists.
-                if ( ! $has_default_theme ) {
+                if ( ! $has_default_theme && class_exists( 'WP_Theme' ) && ! WP_Theme::get_core_default_theme() ) {
                         $result['status'] = 'recommended';
 
                         $result['label'] = __( 'Have a default theme available' );