Fail2ban restart will empty iptables?

many articles on the Internet say that restart will empty the rules
https://www.2cto.com/article/.
http://www.cnblogs.com/mchina.
, But I tested it and didn"t seem to have it. Iptables-L-n still has the previous rules.

what"s going on, thank you.

Jan.03,2022
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-7b1f8b-8296.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-7b1f8b-8296.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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