Welp, I might just have to throw a grenade on this. Lets see if bcachefs fsck -pvk can work some miracles…
Here’s the thing. Bcachefs is still under development, and Kent is really careful with his filesystem. This happens to me every now and then if I havent rebooted in a long time or theres a kernel update with filesystem changes it doesn’t like. The trick is to skip the userspace fsck code and pass the -k flag so it uses the kernel fsck code which is much farther along. I’ve never lost anything on this filesystem and its messed up in lots of bizzare ways.