Migrate deliver conf from 2.3 to 2.4 help and get panic

I'm trying to migrate my dovecot config from Fedora 42's dovecot-2.3.21.1-5.fc42.x86_64 to Fedora 43's dovecot-2.4.1-6.fc43.x86_64.

I use this command to run the LDA via deliver.sh:

#!/bin/sh exec /usr/libexec/dovecot/deliver -c $HOME/fetchmail/barry@barrys-emacs.org/dovecot-deliver-rc -e "$@"

It's called from a procmail script like this:

LDA="$HOME/fetchmail/$MAILACCOUNT/deliver.sh"

:0

• ^List-Id:.*<dovecot.dovecot.org> | $LDA -m "Others.Dovecot"

The dovecot-deliver-rc that I use for 2.3 is

log_path = /home/barry-mail/fetchmail/barry@barrys-emacs.org/logs/deliver.log

protocol lda { postmaster_address = barry@barrys-emacs.org mail_location = maildir:~/Maildir lda_mailbox_autocreate = yes }

But for 2.4 that config is invalid. For 2.4 I iterated to this:

dovecot_config_version = 2.4.0 dovecot_storage_version = 2.4.0

protocol lda { postmaster_address = barry@barrys-emacs.org lda_mailbox_autocreate = yes log_path = /home/barry-mail/fetchmail/barry@barrys-emacs.org/logs/deliver.log mail_driver = maildir mail_home = /home/barry-mail mail_path = /home/barry-mail/Maildir }

But that crashed /usr/libexec/dovecot/deliver

Panic: file mailbox-list.c: line 1163: unreached Error: Raw backtrace: libdovecot.so.0(backtrace_append+0x40) [0x7efe1a0f8320] libdovecot.so.0(backtrace_get+0x2f) [0x7efe1a0f846f] libdovecot.so.0(+0x101322) [0x7efe1a101322] libdovecot.so.0(+0x101365) [0x7efe1a101365] libdovecot.so.0(+0x2ad0f) [0x7efe1a02ad0f] libdovecot.so.0(+0x2b062) [0x7efe1a02b062] libdovecot-storage.so.0(+0x13dd5) [0x7efe1a28cdd5] libdovecot-storage.so.0(+0x6bfcc) [0x7efe1a2e4fcc] libdovecot-storage.so.0(mail_storage_create+0x504) [0x7efe1a2b56b4] libdovecot-storage.so.0(raw_storage_create_from_set+0x1ab) [0x7efe1a31672b] deliver(main+0x800) [0x557e6bbab6a0] libc.so.6(+0x35b5) [0x7efe19e0f5b5] libc.so.6(__libc_start_main+0x88) [0x7efe19e0f668] deliver(_start+0x25) [0x557e6bbac0e5]

Is the config for 2.4 in principle correct? Where do I report the crash?

Barry