dovecot - Apr 2022 - falsely log "auth: unknown user" when multiple userdb

Hello,
?
When there is a multiple userdb to look for user, Dovecot log ?auth:?unknown
user? when the?first userdb search failed. Then Dovecot ?successfully search
user in the?second userdb and things works. But ?"auth: unknown user"
event left in a logs.
?
Logs look like this:
?
Apr ?1 12:38:48 mail dovecot[75384]: lmtp(75397): Connect from 127.0.5.1
Apr ?1 12:38:48 mail dovecot[75384]: auth: ldap(order at XXX,127.0.5.1): unknown
user
Apr ?1 12:38:48 mail dovecot[75384]:
lmtp(order)<75397><D8m2HCjIRmKFJgEAABdyCg>:
msgid=<157609214.20220331172309 at YYY>: saved mail to INBOX
?
Debug show failed search in the?first userdb and successfull search in
the?second userdb.
?
When user found in the?first userdb??unknown user??event does not appear.
?
Configuration is:?
?
userdb {
? args = /usr/local/etc/dovecot/udb-ldap-personal.conf
? driver = ldap
? override_fields = home=/mnt/mboxes/personal/%n
}
userdb {
? args = /usr/local/etc/dovecot/udb-ldap-general.conf
? driver = ldap
? override_fields = home=/mnt/mboxes/general/%n
}
?
Dovecot verision is?2.3.16 (7e2e900c1a).
?
?
--
Best regards,
Anthony Pankov
?
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> When there is a multiple userdb to look for user, Dovecot log ?auth:
unknown user? when the first userdb search failed.
> Then Dovecot  successfully search user in the second userdb and things
works.
> But  "auth: unknown user" event left in a logs.

On systemd using rsyslog i added this to rsyslog config:

   if $programname == "dovecot" and $msg contains "- trying the
next userdb" then stop