I try to run an authoritative server only on bind 9.4.2-P2 with a
mysql-dlz connection.
options {
directory "/var/bind";
listen-on { myself; };
listen-on-v6 { none; };
statistics-file "/var/bind/stats/named.stats";
version "None of your business";
allow-query { netplus; };
blackhole { blacklist; };
pid-file "/var/run/named/named.pid";

When I dig on my old authoritative server (bind 9.4.2-p2 without dlz)
I have an ADDITIONAL SECTION which I d'ont have on my new server :
dns1.zzzz.ch. 86400 IN A
dns2.zzzz.ch. 86400 IN A
dns3.zzzz.ch. 86400 IN A

In MySQL database I have put all records from the zone, include the A
record for the dnsX ....

Is there a reason? What I have not understood?