I found this from 2019 on the list: https://www.mail-archive.com/dovecot@dovecot.org/msg78898.html
Timo mentioned it's tracked internally as DOP-1501, but I could find nothing about it being fixed on the (public) list.
Any news about that and is the workaround of deleting dovecot.mailbox.log* and
dovecot.list.index* still the recommendation, when running into this bug. Ralf -- Ralf Becker EGroupware GmbH [www.egroupware.org] Handelsregister HRB Kaiserslautern 3587 Geschäftsführer Birgit und Ralf Becker Leibnizstr. 17, 67663 Kaiserslautern, Germany Telefon +49 631 31657-0