Strange search behavior

Hello,

I experienced a strange behavior in the way dovecot is performing searches, I only experienced this exact issue with the flag "seen".

If I perform this command:

UID SORT (SIZE) UTF-8 FLAGGED SEEN

Dovecot return every seen messages even if the message is not "flagged'.

This is only happening when there is no unseen messages in the mailbox, if there is at least one, this is working properly.

Any though ?

Thanks.