I think the really crazy default is that flakes by default will not include git submodules, you need to pass a special flag to enable it, which is undocumented

I think the really crazy default is that flakes by default will not include git submodules, you need to pass a special flag to enable it, which is undocumented and have to dig through github issues: https://github.com/NixOS/nix/issues/4423 https://github.com/NixOS/nix/issues/4423