nic.mx fails to validate (on current master)
DNSSEC data seems OK, according to other resolvers and http://dnsviz.net/d/nic.mx/dnssec/
[resl] => querying: '200.23.1.1' score: 10 zone cut: 'mx.' m12n: 'nIC.Mx.' type: 'A' proto: 'udp'
[iter] <= using glue for 'i.mx-ns.mx.': '207.248.68.1'
[iter] <= using glue for 'x.mx-ns.mx.': '201.131.252.1'
[iter] <= using glue for 'e.mx-ns.mx.': '189.201.244.1'
[iter] <= using glue for 'o.mx-ns.mx.': '200.23.1.1'
[iter] <= using glue for 'c.mx-ns.mx.': '192.100.224.1'
[iter] <= using glue for 'c.mx-ns.mx.': '2001:1258::1'
[iter] <= using glue for 'm.mx-ns.mx.': '200.94.176.1'
[iter] <= using glue for 'm.mx-ns.mx.': '2001:13c7:7000::1'
[iter] <= referral response, follow
[vldr] <= couldn't validate RRSIGs
It tries to validate even though the delegation is insecure. The query for nic.mx. DS +dnssec
is correctly validated as NODATA, but interestingly the AD flag is not set in this case.