Even less IPv6 support than docker. With docker you can at least get it to work somehow, even if it is totally different from IPv4, weirdly. Podman just has no IPv6 support to speak of.
I was researching this few hours ago and according to https://github.com/containers/podman/issues/6114#issuecommen... it just works when you add another network.
Docker registry having no IPv6 is another fun story tho.
IPv6 support is always like this: half-baked at best, someone got it to work somehow, developers declare it done since it worked for someone. Then crickets...
IPv6 support isn't done until you can replace IPv4 with it, with no changes to your config except addresses. Even docker isn't there yet. And podman's is still in a larval state.