Ticket #54973: 54973.2.patch

src/class-wp-import.php

@@ -423 +423 @@
                                 'category_description' => wp_slash( $description ),
                         );
 
-                        $id = wp_insert_category( $data );
+                        $id = wp_insert_category( $data, true );
                         if ( ! is_wp_error( $id ) && $id > 0 ) {
                                 if ( isset( $cat['term_id'] ) ) {
                                         $this->processed_terms[ intval( $cat['term_id'] ) ] = $id;