Cyrus 2.4 and dm with delayed expunge

[Marco]

Hello,

  I notice that in Cyrus 2.4.16 and 2.4.17 with delayed expunge, if I  
remove a deleted folder with dm in cyradm, as:

  > dm DELETED/user/john.doe at domain.org

then the mailbox is removed only from DB and not from file system.

I have to run cyr_expire to delete the mailboxes from DB and file system too.

I don't know if this is a bug. Anyway this behaviour is dangerous,  
because reconstruct could discover previously deleted mailbox.

Unfortunately, in my Cyrus, also if I don't use 'dm', 'ctl_mboxlist  
-v' claims that many entries have a directory, but no DB entry.
Do you know other situations that could produce this?

Thank you very much
Marco