I thought there was a different redirect on ipv6 for a moment, maybe there was for a short time.
x.com on ipv4 maps to 104.18.16.213 and ipv6 maps to 2606:4700::6812:10d5 and that right now is a cloudflare server with a 302 redirect to "https://.twitter.com" most importantly is, SSL doesn't work on it. It fails with an ssl error on curl.