[BUG] Treesitter syntax highlighting is broken

[willifan]

Field	Description
Plugin	treesitter
Nixpkgs	unstable
Home Manager	unstable

• I have read the FAQ and my bug is not listed there.

Description

The syntax of many expressions when editing nix is not highlighted correctly, I have attached images to show this better below. I have checked a few commits in my nixos flake to know when this happened which was December 1st when I updated my flake, the last update before that is November 14th so it must have been introduced during that time. I have tested :checkhealth nvim-tree-sitter and nix is available, when I dis- or enable treesitter the syntax highlighting does change, it is just incorrect. Other languages, I tested c++ and rust, are highlighted correctly so it seems like an issue with tree-sitter-nix, although I did not find any commits there, or anywhere else for that matter, that seem like a likely cause.

Minimal, Reproducible Example (MRE)

programs.nixvim = {
  enable = true;
  plugins.treesitter = {
    enable = true;
    settings.highlight.enable = true;
  };
};

How it should look:

How it looks now

[MattSturgeon]

Just a guess, but sometimes there's also LSP-baser highlighting in addition to treesitter.

If you are seeing something change when toggling treesitter's highlighting it sounds to me like that's working.

Perhaps it is LSP based highlighting that changed?