user ip access rules lost

Hello Everyone,

Consider other system's integration, I migrated users to databse.
Everything seems to be working fine, But there was one question.

when a user expired,or edit user manual make them expired,
click save button,then user ip access rules will lost,
I can't find this action triggered by any settings.

Because these ip access rules are useful to me,I still need them.

And I have test database with sql server and mysql, the same result.
But it doesn't happend when edit a domain user.
Then I think this cause by the design of servu,so how can I improve him.

Server OS: Windows Server 2019 Standard
ODBC on Server: 10.0.17763.1
mysql-odbc-driver: 8.0.28
Mysql Server: 8.0
sqlserver-odbc-driver: 2017.177.02.01
Sql Server: 15.00.2080
ServU: 15.1,15.3