Problem with "modify_dns" command

I am trying to use the –remove-record flag for this command as detailed on this page:

It does not appear to do anything. I am trying to remove an invalid name server from my zone file:

virtualmin modify-dns --domain --remove-record “@ NS”

The above does not do anything to remove the incorrect record.

Hmm, the feature seemed to work fine when I used “Webmin -> BIND -> Update Record in Selected”.