IDLE not working for one account only

[Neil Price]

Here's a comparison of a non-working idle with a good one. You can see 
the bad user does not report message arrival while the good one does.
Looks like something odd with the /seen flags ("nonjunk" is missing) . 
Can someone explain what it means?
This account was converted from 2.2 I wonder if that's it..... ?

Bad user:
telnet 127.0.0.1 143
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE AUTH=PLAIN SASL-IR] ctgw-3 
Cyrus IMAP 2.5.10-Debian-2.5.10-3 server ready
a01 login baduser secret
a01 OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE ACL RIGHTS=kxten QUOTA 
MAILBOX-REFERRALS NAMESPACE UIDPLUS NO_ATOMIC_RENAME UNSELECT CHILDREN 
MULTIAPPEND BINARY CATENATE CONDSTORE ESEARCH SORT SORT=MODSEQ 
SORT=DISPLAY SORT=UID THREAD=ORDEREDSUBJECT THREAD=REFERENCES 
ANNOTATEMORE ANNOTATE-EXPERIMENT-1 METADATA LIST-EXTENDED LIST-STATUS 
LIST-MYRIGHTS WITHIN QRESYNC SCAN XLIST XMOVE MOVE SPECIAL-USE 
CREATE-SPECIAL-USE URLAUTH URLAUTH=BINARY LOGINDISABLED COMPRESS=DEFLATE 
X-QUOTA=STORAGE X-QUOTA=MESSAGE X-QUOTA=X-ANNOTATION-STORAGE 
X-QUOTA=X-NUM-FOLDERS IDLE] User logged in 
SESSIONID=<cyrus-29583-1528202644-1-625909272457112057>
a02 select inbox
* 2591 EXISTS
* 2 RECENT
* FLAGS (\Answered \Flagged \Draft \Deleted \Seen $Forwarded icc-forward 
$MDNSent)
* OK [PERMANENTFLAGS (\Answered \Flagged \Draft \Deleted \Seen 
$Forwarded icc-forward $MDNSent \*)] Ok
* OK [UNSEEN 2589] Ok
* OK [UIDVALIDITY 1485844192] Ok
* OK [UIDNEXT 14864] Ok
* OK [HIGHESTMODSEQ 1] Ok
* OK [URLMECH INTERNAL] Ok
* OK [ANNOTATIONS 65536] Ok
a02 OK [READ-WRITE] Completed
a03 idle
+ idling

(Nothing reported when message sent to this address)
----------------------------------------------------------------------------------------------
Now the good client
telnet 127.0.0.1 143
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE AUTH=PLAIN SASL-IR] ctgw-3 
Cyrus IMAP 2.5.10-Debian-2.5.10-3 server ready
a01 login gooduser evenmoresecret
a01 OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE ACL RIGHTS=kxten QUOTA 
MAILBOX-REFERRALS NAMESPACE UIDPLUS NO_ATOMIC_RENAME UNSELECT CHILDREN 
MULTIAPPEND BINARY CATENATE CONDSTORE ESEARCH SORT SORT=MODSEQ 
SORT=DISPLAY SORT=UID THREAD=ORDEREDSUBJECT THREAD=REFERENCES 
ANNOTATEMORE ANNOTATE-EXPERIMENT-1 METADATA LIST-EXTENDED LIST-STATUS 
LIST-MYRIGHTS WITHIN QRESYNC SCAN XLIST XMOVE MOVE SPECIAL-USE 
CREATE-SPECIAL-USE URLAUTH URLAUTH=BINARY LOGINDISABLED COMPRESS=DEFLATE 
X-QUOTA=STORAGE X-QUOTA=MESSAGE X-QUOTA=X-ANNOTATION-STORAGE 
X-QUOTA=X-NUM-FOLDERS IDLE] User logged in 
SESSIONID=<cyrus-29583-1528203335-1-14328682196982078509>
a02 select inbox
* 11664 EXISTS
* 0 RECENT
* FLAGS (\Answered \Flagged \Draft \Deleted \Seen nonjunk $has_cal 
$Forwarded $MDNSent junk $label3 $label2 icc-forward $label1 $label4)
* OK [PERMANENTFLAGS (\Answered \Flagged \Draft \Deleted \Seen nonjunk 
$has_cal $Forwarded $MDNSent junk $label3 $label2 icc-forward $label1 
$label4 \*)] Ok
* OK [UNSEEN 10133] Ok
* OK [UIDVALIDITY 1522916393] Ok
* OK [UIDNEXT 18594] Ok
* OK [HIGHESTMODSEQ 33536] Ok
* OK [URLMECH INTERNAL] Ok
* OK [ANNOTATIONS 65536] Ok
a02 OK [READ-WRITE] Completed
a03 idle
+ idling
* 11665 EXISTS
* 1 RECENT
* 11665 FETCH (FLAGS (\Recent nonjunk))