dovecot - Feb 2023 - doveadm: Error: Mailbox INBOX: Deleting corrupted cache: Cache file too large

Hi!

Upon issuing a 
% doveadm import -u restore at backup.invalid mdbox:/home/storage/mdbox
I'm getting a:
doveadm(restore at backup.invalid): Error: Mailbox INBOX: Deleting corrupted
cache: Cache file too largea
doveadm(restore at backup.invalid): Error: Corrupted dbox file
/home/restore/mdbox/storage/m.7 (around offset=41602004): msg header has bad
magic value
doveadm(restore at backup.invalid): Error: Corrupted dbox file
/home/restore/mdbox/storage/m.8 (around offset=17193748): msg header has bad
magic value

message -- but the process keeps running!

Should I worry?

dovecot packages: 2.3.20-3+ubuntu20.04

-- 
Ralf Hildebrandt
  Gesch?ftsbereich IT | Abteilung Netzwerk
  Charit? - Universit?tsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | https://www.charite.de