Hello,
as i'm using a laptop, i always use Availability Groups in packet filter and nat, so i can create one rules with both wifi and wire ip of my laptop.
I set up ipv6; add the new ip in the already created host definitions (wire and wifi so v4/v6 host def) and try to test ipv6, everything is bocked by packet filter.
I try with ipv6 only hosts in the Availability group, same.
with host (v4/v6 or v6 only) it works, with network group it works too.
See attached files for details