Yes know problem. But also known that they work on it.
I fail to understand how it can be 2023, and GitLab have full IPv6 support, but GitHub is all "... oh, is this IPv6 thing new? we'll put it on the backlog with the extremely limited resources of .. err, Microsoft .. who are currently occupied with some OpenAI something-or-other ..."
It's just reality, it's hard to care about non-problems, specially when fixing them creates real my-problems.