The typical behavior is that DNS returns an IPv6 address, then whatever-it-is sits there until a timeout, because it’s simply not being routed. I’ve not investigated further because turning off IPv6 fixes the problem and breaks nothing (that I care about). Anything that only returns an IPv4 address from DNS works either way.
My cellular connection supports IPv6, but testing sites report it’s misconfigured in a bunch of ways. I don’t see problems in practice, though. But on my home network, it’s turned off.
My cellular connection supports IPv6, but testing sites report it’s misconfigured in a bunch of ways. I don’t see problems in practice, though. But on my home network, it’s turned off.