Error: Mailbox INBOX: Broken file dovecot-uidlist: Invalid data

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Error: Mailbox INBOX: Broken file dovecot-uidlist: Invalid data

Dovecot mailing list
Hi list,

today a user reported messages are disappearing from his INBOX and I discovered a two digit number of mailboxes with broken dovecot-uidlist files.

The log says:

Oct 29 08:51:34 mail02 dovecot: lmtp([hidden email])<5270><QOoVJIbvt12WFAAAJOVBUw>: Error: Mailbox INBOX: Broken file /var/vmail/example.com/info/dovecot-uidlist line 88: Invalid data:

And the respective files do look broken:

4596 :1572344253.M529133P14861.mail03.example.com,S=53053,W=54233
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@4597 :1572344797.M93833P15905.mail03.example.com,S=126866,W=129256

Setup : Behind a director I am running two dovecot backend servers sharing the vmail directory via NFS.

Do you have an idea where this might come from? How can I debug this further?

Cheers,
Dirk