[DNS] DIG can't resolve but HOST and NSLOOKUP can

Hi!

I have set up a bind9 local DNS with rescursion turned off.

From the DNS server, if I query google.es using DIGit returns:

;; WARNING: recursion requested but not available

However, if I use HOST, it works:

google.es has address 216.58.215.131

Same happens with NSLOOKUP

nslookup google.es
;; Got recursion not available from 172.17.70.1, trying next server
Server:212.230.135.2
Address:212.230.135.2#53

I expected neither of them to succeed.

Why this behaviour?

Thanks!