Failed creating new shared mailboxes with error "Mailbox already exists"

Hello,

since I upgraded cyrus imapd from 3.2.6-2+deb11 to 3.6.1-4+deb12u2 a 
while ago I notice issues while creating new shared mailboxes using cyradm.

For example:

localhost> cm shared/[email protected]
createmailbox: Mailbox already exists
localhost> lm shared/[email protected]
localhost> lam shared/[email protected]
Mailbox does not exist

Recently I used a workaround, I recreated a previously renamed shared 
mailbox using a different domain and renamed it to the domain of choice. 
But it doesn't work here.

localhost> cm shared/[email protected]
createmailbox: Mailbox already exists
localhost> lam shared/[email protected]
Mailbox does not exist

I'm pretty sure that I've never created a mailbox named 
[email protected] and I'm 100% sure that never beeing 
created a mailbox named [email protected].


While a workaround would be pretty good at the moment, there must be an 
issue which should be solved sooner than later. What I've tried is 
checking the db using ctl_mboxlist and chk_cyrus, but there was no hint 
to the existence of techdoc-intern@. chk_cyrus stopped with

bad mailbox easterngraphics.com!user.alxxx

and I've no idea how to skip this message and resume the check.


Any hints to go further are welcome.

Thx
Christian
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