socket dovecot-lmtp is not created anymore

[ratatouille]

Hello!

Since experiments on my testserver two days ago
/var/spool/postfix/private/dovecot-lmtp
is not created anymore.

This the setting in /etc/dovecot/conf.d/10-master.conf

service lmtp {
 unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
}

I searched nearly the whole system for lmtp but can't find the reason
why.

What can I do? Debug?

  Andreas