There is a bug report for this issue and has been fixed in later release:
https://phabricator.vyos.net/T4259
Workaround:
sudo sed -i 's/$CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -d/systemctl restart conntrackd.service/' /usr/libexec/vyos/vyos-vrrp-conntracksync.sh