Strange Bug: Have to restart Mail-Clients to see new (recent) Mails

[email protected]
Newsgroups gmane.mail.imap.cyrus
Message-ID <[email protected]>
Hi,

I hope, this is the correct channel to ask my question.

We discovered a very strange Bug on cyrus-imapd/oldstable,now 3.0.8-6+deb10u6 amd64 (Plain Debian Buster). Mail Clients, especially Thunderbird, must be restarted to see new (recent) Messages. 

With help from trustworthy Wireshark and "openssel s_client" I could break the effect/bug(?) down to some strange behavior:

 * With an active IDLE command, RECENT notifications won't get pushed to the client. IDLE won't
send any notifications.
 * SEARCH ALL or UID SEARCH ALL wont report newly arrived messages
 * Your have to perform a SELECT INBOX (or any other folder) to get new messages. After sending
SELECT INBOX both command (SEARCH and UID SEARCH) will report RECENT messages.

Is this a bug? A configuration error? Anyone got same effect? Any advice?

Greetings
Jörg

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