I have the same problem after updating dovecot 2.3.21, I am receiving the 
errors below for the accounts when I perform backups.

doveadm([email protected]): Error: Purging namespace '' failed: BUG: Unknown 
internal error
Error: failed sync dir: doveadm([email protected]): Warning: mdbox 
/data/data/mailboxbackup/20240207/user2.com.br/u/ser/user2.com.br/mdbox/storage:
 Inconsistency in map index (42,40 != 42,56)
doveadm([email protected]): Warning: fscking index file 
/data/data/mailboxbackup/20240207/user2.com.br/u/ser/user2/mdbox/storage/dovecot.map.index
doveadm([email protected]): Warning: mdbox 
/data/data/mailboxbackup/20240207/user2.com.br/u/ser/user2.com.br/mdbox/storage:
 rebuilding indexes
doveadm([email protected]): Warning: Transaction log file 
/data/data/mailboxbackup/20240207/user2.com.br/u/ser/user2/mdbox/storage/dovecot.map.index.log
 was locked for 284 seconds (mdbox storage rebuild)
doveadm([email protected]): Error: Purging namespace '' failed: BUG: Unknown 
internal error

As in the case of our friend the other day, the error no longer happens on the 
same account, it happens on another random one.
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