Still not ready for regular DNS use
When I was setting up the DNS for a site last year I decided to go full IPV6 because why not? It turned out the why not is because a bunch of browsers seemingly can't work with IPV6 addressing and just wouldn't find the site. I shifted to V4 and everything worked as normal. That was a genuine surprise to me, but there's not much point in a website that a proportion of users simply cannot access, so I'm stuck with V4 for the time being.