Problem with DDNS update to BIND 9.16.27 from ISC DHCPv6

Hello all, I have a problem that my DHCPv6 DDNS update which works reliably with IPv4 doesn't work at all when we implemented the dual-stack operation. There is not even a warning, notice or error in the log. No syntax errors in the config /etc/dhcp/dhcpd6.conf file. We are running Debian 10

DHCPv6 DDNS update problem

Hello all, I have a problem that my DHCPv6 DDNS update which works reliably with IPv4 doesn't work at all when we implemented the dual-stack operation. There is not even a warning, notice or error in the log. No syntax errors in the config /etc/dhcp/dhcpd6.conf file. We are running Debian 10