Nix develop using old flake version

nix develop gives a different result from nix develop .#devShells.x86_64-linux.default. This is weird, since the debug logs show that it is being read at the right commit hash as well… $ nix develop -vv evaluating derivation 'git+file:///home/jack/dev/infopt_PV#devShells.x86_64-linux.default'... fetching git input 'git+file:///home/jack/dev/infopt_PV' using revision 6f90a2bc6cf98fd970de6555791c4401d9fddb1d of repo '/home/jack/dev/infopt_PV' evaluating derivation 'https://github.com/NixOS/nixpk...