Possible bug on Fail2ban jail edit

SYSTEM INFORMATION
OS type and version Debian 12
Webmin version 2.202
Virtualmin version 7.20.2
Webserver version Apache
Related packages Fail2Ban

In the Filter Action Jail, let’s say I want to disable the proftpd jail. A while back I would just click on proftpd and click “no” on " Currently enabled?" on the “Edit jail” screen, then save and the proftpd was marked as “Enabled = no” in the list of jails.
Now if I click “no” I get an error stating :

Failed to save jail : Invalid port name, number or range; use a single port name, number or a range in the form start:end; to specify multiple ports, separate them with commas

All these infos are not relevant if I want that jail disabled, so the only solution I found was to delete that jail. This was working before, I don’t know exactly when it changed, I didn’t start any new servers during summer but 3-4 in the past weeks and had the problem for all of them.

Thanks,
Pierre

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