Thanks for filing the bug. We've another issue related here since the AUTOCONF controls ipv6 router advertisements. the V1 network-config doesn't allow one to express whether you want to opt-in or out of router advertisements which may be desired with either static6 or dhcp6.
In netplan (network-config version=2) one can provide:
accept-ra: true|false
Which in sysconfig rendering could be used to toggle IPV6_AUTOCONF.
Thanks for filing the bug. We've another issue related here since the AUTOCONF controls ipv6 router advertisements. the V1 network-config doesn't allow one to express whether you want to opt-in or out of router advertisements which may be desired with either static6 or dhcp6.
In netplan (network-config version=2) one can provide:
accept-ra: true|false
Which in sysconfig rendering could be used to toggle IPV6_AUTOCONF.