Very strange choice to run a public instance that is IPv6-only. Unless federation is disabled altogether, in which case it doesn't matter, joining a room from

Very strange choice to run a public instance that is IPv6-only. Unless federation is disabled altogether, in which case it doesn't matter, joining a room from an IPv6-only instance with other servers in the room that only speak IPv4 will result in a quite terrible experience. Both sides will depend on dual-stack servers in the room to fill gaps and that will likely only happen when the missing events from the remote side are referenced by something else.