Discrepancy: stream.nmsgs < SA_MESSAGES

I'm interfacing with the Gmail IMAP server.

Is it normal that stream.nmsgs is smaller than the status->messages
returned by mm_status when calling status_mail(...SA_MESSAGES)? It
seems stream.nmsgs is the more correct number, since trying to
retrieve the ELT of the mail with messageindex stream.nmsgs+1 (<
status.messages) generates a "Bad msgno" error. This happens with only
one specific Mailbox, but different users are reporting different
differences. From only 3 to as many as 50 "phantom" mails.

It's probably a bug in the Gmail IMAP server, just like the problem I
had in my previous mail, but I wanted to check either way.

All the best,
David