3351801 - Why SYSTEM user is not deactivated after passing maximum_unused_productive_password_lifetime?

If SYSTEM user is not used for certain days, you want to block the logon of SYSTEM user to avoid any miss usage of it (security perspective).
Password policy: maximum_unused_productive_password_lifetime=n for specific user group has been configured for SYSTEM user, however, SYSTEM user is not deactivated after n days.
For the other DB users, they get deactivated after passing maximum_unused_productive_password_lifetime defined time period.

SAP HANA, platform edition 2.0

HANA, user, password policy, maximum_unused_productive_password_lifetime, deactivate, is_password_lifetime_check_enabled , KBA , HAN-DB-SEC , SAP HANA Security & User Management , Problem