dovecot - Nov 2022 - Doveadm backup stateful synchronization trouble

Hi,

The non-blocking error is:
doveadm(user1s at domain): Error: Saved sync state is invalid, falling back to
full sync: Invalid base64 data

This error occurs every time on my test machine (no traffic, only a few test
messages). That error sometime also occurs on my production system, but not each
time.

The command I used for the first time is : doveadm backup -A -s "" -d
> state.txt
After that there is a daily calls (as vmail user, my config only handle virtual
users) to :
doveadm backup -A -s "$(<state.txt)" -d > state.txt.tmp
&& mv state.txt.tmp state.txt

doveconf -n output is available at
https://www.f-hamelin.fr/pub/doveadm-backup-doveconf.txt

Any help will be welcomed 
Best regards,
Franck 
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