why proxmox firewall on container doesn't support ipv6 ports and iptables inside the os yes?

[openaspace]

Hello,
why proxmox firewall on container doesn't support ipv6 ports and iptables inside the os yes? or i'm wrong?
sudo ip6tables -A INPUT -p tcp --dport 9993 -j ACCEPT
sudo ip6tables -A INPUT -p tcp --dport 10998 -j ACCEPT