It seems that response list is missing all those ipv4 resource lines that before were returned as RANGE instead of CIDR, and obviously related asn.
For example
151.3.0.0/16 is related to country IT (
https://stat.ripe.net/data/whois/data.json?resource=151.3.0.0/16) but
this prefix and its ASN is missing in response country resource list of above query.
Earlier ,sure at 13 JUL 2014, this prefix was in response as contained in range 151.3.0.0-151.84.255.255.