Man pages matching name ip6tables-save in section 8:

ip6tables-save.8.en	debian 10 / iptables
ip6tables-save.8.ja	debian 10 / manpages-ja
ip6tables-save.8.pl	debian 10 / manpages-pl
ip6tables-save.8.en	debian 11 / iptables
ip6tables-save.8.ja	debian 11 / manpages-ja
ip6tables-save.8.pl	debian 11 / manpages-pl
ip6tables-save.8.en	debian 12 / iptables
ip6tables-save.8.de	debian 12 / manpages-de
ip6tables-save.8.ja	debian 12 / manpages-ja
ip6tables-save.8.pl	debian 12 / manpages-pl