[Dovecot] sieve problem after upgrade to 2.1.12

[Daniel Funke]

Hi,

I have a sieve filter for a mailbox with amavisd-admin mails.
if header :regex "Subject" "^INVALID HEADER"
{
        fileinto "INVALID HEADER";
}

After the upgrade to dovecot 2.1.12 this filter doesn't work for some 
(16) messages with this subject. For 424 messages it worked correct.

Any ideas where to look?

Bye
Daniel