LSP[haskell-language-server]: Error INVALID_SERVER_JSON: "Expected value but found unexpected end of string at character 204"

[jackrosenberg]

I have confirmed that this is a bug related to nvf

• This is a bug, and not an user error or a support request. I understand that my issue will be closed if it is not a bug in nvf.
• I have checked the issues tab and confirmed that my issue has not yet been reported. I understand that my issue will be closed if it is a duplicate.

Description

nvf config here

have haskell stuff installed via direnv:

      devShells."${system}".default = pkgs.mkShell {
        strictDeps = true;
        nativeBuildInputs = with pkgs; [
          cabal-install
          haskell.compiler.ghc925
          haskell-language-server
          # version 408.2, build with ghc 9.2.5
          (haskellPackages.z3.overrideAttrs {
            compiler = pkgs.haskell.compiler.ghc925;
          }) 
        ] ++
        [ self.packages."${system}".gclparser ];
      };
  };
}

after editing app/main.hs in neovim the LSP fails, logs here: https://paste.jackr.eu/JcFT5Buq3bb

Installation Method

NixOS Module (nixosModules.default)

Installation Method (Other)

No response

nvf Version

"repo": "nvf",
"rev": "45ad22485d23bf131e3543eb7de16d0adf274e8b",

Reproduction steps

1. open 'app/main.hs'
2. read error at bottom of screen.

Expected behavior

no error

Actual Behavior

yes error

System Information

- system: `"x86_64-linux"`
 - host os: `Linux 6.18.45, NixOS, 26.11 (Zokor), 26.11.20260822.2c423e0`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Lix, like Nix) 2.95.2
System type: x86_64-linux
Additional system types: i686-linux, x86_64-v1-linux, x86_64-v2-linux, x86_64-v3-linux, x86_64-v4-linux
Features: gc, signed-caches
System configuration file: /etc/nix/nix.conf
User configuration files: /home/jack/.config/nix/nix.conf:/etc/xdg/nix/nix.conf:/home/jack/.nix-profile/etc/xdg/nix/nix.conf:/nix/profile/etc/xdg/nix/nix.conf:/home/jack/.local/state/nix/profile/etc/xdg/nix/nix.conf:/etc/profiles/per-user/jack/etc/xdg/nix/nix.conf:/nix/var/nix/profiles/default/etc/xdg/nix/nix.conf:/run/current-system/sw/etc/xdg/nix/nix.conf
Store directory: /nix/store
State directory: /nix/var/nix
Data directory: /nix/store/vnafrww9nnqb9y6p9m1nq5nmbafwm7db-lix-2.95.2/share`
 - nixpkgs: `/nix/store/d6mryll7gbj6hbczvyrvnflcyxxq11zn-source`

Relevant log output

https://paste.jackr.eu/d99vWZ8ggri