Following Easy to get started(flake) error with cli.nix not found

[countoren]

Running:

nix shell github:styx-static/styx
styx new site my-site              
cd my-site
styx preview 

cause

error: getting status of '/home/.../my-site/src/app/cli.nix': No such file or directory

it might be related to the way flake parse relative path vs nix-build.