Bug: cannot accept or reject `nixConfig` in flake in fish

When I have something in my nix flake's `nixConfig`... ```nix { nixConfig = { extra-substituters = [ "https://playit-nixos-module.cachix.org" ]; extra-trusted-public-keys = [ "playit-nixos-module.cachix.org-1:22hBXWXBbd/7o1cOnh+p0hpFUVk9lPdRLX3p5YSfRz4=" ]; }; } ``` It shows me a warning ``` do you want to allow configuration setting 'extra-substituters' to be set to 'https://playit-nixos-module.cachix.org' (y/N)? ``` but I cannot accept or reject it with y/n. the only way is to cancel the direnv `C-c` and manually allow it by `nix develop`