nixd Language server does not show auto-completion for specified options

[DrBuhu]

Thank you for the bug report

• I am using the latest version of lsp-mode related packages.
• I checked FAQ and Troubleshooting sections
• You may also try reproduce the issue using clean environment using the following command: M-x lsp-start-plain

Bug description

The autocomplete on special functions like pkgs, and homemanager doesnt seem to work, pressing tab doesn't show any options as it would with other functions.

Steps to reproduce

Using: doom emacs
Going into a nix configuration file
Pressing: tab on pkgs. /home-manager
Code:

(use-package nix-mode
  :after lsp-mode
  :custom
  (lsp-disabled-clients '((nix-mode . nix-nil))) ;; Disable nil so that nixd will be used as lsp-server
  :config
  (setopt lsp-nix-nixd-server-path "nixd"
    lsp-nix-nixd-formatting-command [ "nixpkgs-alejandra" ]
    lsp-nix-nixd-nixpkgs-expr "import (builtins.getFlake \"/etc/nixos/\").inputs.nixpkgs { }"
    lsp-nix-nixd-home-manager-options-expr "(builtins.getFlake \"/etc/nixos\").homeConfigurations.unwary.options"
  )

)

Full code:
https://github.com/DrBuhu/.doom.d/blob/main/config.el
https://github.com/DrBuhu/.doom.d/blob/main/init.el

Expected behavior

List of packages/options of home home manager

Which Language Server did you use?

lsp-nixd

OS

Linux

Error callstack

No response

Anything else?

No response