keywords lost when moving a message in a folder

[wouldsmina]

Hi,

I migrate my dovecot server from Debian 9 to Debian 10 (Dovecot 2.3.4.1),
since when I move a message in a folder, keywords systematically disappear.
I'm using Thunderbird 60.8.
Would an option have escaped me? or is there a bug on this version of
dovecot?

Dovecot 2.3.4.1
OS : Debian 10.0 x64
FS : Ext4

dovecot -n result :
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.4 ()
# OS: Linux 4.19.0-5-amd64 x86_64 Debian 10.0
# Hostname: suzuki.domain.tld
auth_cache_size = 1 k
auth_failure_delay = 3 secs
base_dir = /var/run/dovecot/
default_vsz_limit = 4 G
first_valid_uid = 100
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
login_greeting = mail system ready.
login_trusted_networks = 172.16.0.0/12 192.168.0.0/16
mail_fsync = always
mail_location = mbox:~/mail:INBOX=/var/mail/%u
mail_prefetch_count = 20
mail_privileged_group = mail
mailbox_idle_check_interval = 1 mins
mmap_disable = yes
namespace inbox {
  inbox = yes
  location = maildir:~/Maildir
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix = INBOX.
  separator = .
  subscriptions = yes
  type = private
}
passdb {
  driver = pam
}
plugin {
  acl_shared_dict = file:/var/lib/dovecot/shared-mailboxes
  sieve = ~/sieve/.dovecot.sieve
  sieve_after = /etc/dovecot/sieve.after
  sieve_before = /etc/dovecot/sieve.before
  sieve_before2 = ~/sieve/.dovecot.vacation.sieve
  sieve_dir = ~/sieve
  sieve_editheader_forbid_add = X-Verified
  sieve_editheader_forbid_delete = X-Verified X-Seen
  sieve_editheader_max_header_size = 1k
  sieve_extensions = +editheader
  sieve_max_script_size = 2M
}
postmaster_address = postmaster at domain.tld
protocols = " imap lmtp pop3"
service auth-worker {
  process_min_avail = 6
  service_count = 0
}
service imap-login {
  process_min_avail = 10
  service_count = 0
  vsz_limit = 4 G
}
service imap {
  process_limit = 4096
  vsz_limit = 4 G
}
service pop3 {
  process_limit = 1024
}
ssl_cert = </etc/ssl/certs/suzuki.crt
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
userdb {
  driver = passwd
}
verbose_proctitle = yes
protocol imap {
  mail_max_userip_connections = 25
}

thanks.
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