mariadb-dump to stop using mysql.user view

kostunrix:~ # mysqldump --system=users

/*!999999\- enable the sandbox mode */

-- MariaDB dump 10.19  Distrib 10.11.8-MariaDB, for Linux (x86_64)

...

mysqldump: Couldn't execute 'SELECT CONCAT(QUOTE(u.user), '@', QUOTE(u.Host)) AS u FROM mysql.user u  /*!80001 LEFT JOIN mysql.role_edges e             ON u.user=e.from_user               AND u.host=e.from_host          WHERE e.from_user IS NULL */ /*M!100005 WHERE is_role='N' */': Illegal mix of collations (utf8mb4_unicode_520_ci,COERCIBLE) and (utf8mb4_general_ci,COERCIBLE) for