ISC DHCPv6 server not receving incoming DHCPv6 client info request message

I am running ISC DHCPv6 server and odhcp6c client is sending DHCPv6 info request message. Using tcpdump, I am able to see the client messages in the server ethernet port. But server is not responding/receiving incoming info request (not seeing any log messages for the incoming DHCPv6 info req message). The ISC DHCPv6 version is 4.4.1 in centos7. Looks like that I am seeing following bug reported here in the below URL. can you please confirm ?? if it is related to this below bug, how to resolve it in my ISC DHCP server 4.4.1 version ??

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=882250

Thanks, Rajaram.