Not showing chunk if curly brace is not at start of line

[pinpox]

Describe the bug

If the brace { is not at the beginning of the line, the chunk is not correctly shown.
Consider the following code:

{
  description = "foobar";

  # Nixpkgs / NixOS version to use.
  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
  };

  outputs =
    {
      arg1,
      arg2,
      ...
    }:
    {
      something = "foo";
    };
}

Placing the cursor on line 5: looks like this (no chunk indicated):

Placing it on line 10 looks like this (works correctly):

I would expect the chunk to be shown in both cases. Not having the brace at the start of the line is common in multiple languages, I have only verified the bug with Nix yet.

To Reproduce
Steps to reproduce the behavior:

1. Open snipped above in editor
2. Place cursor on line 5 (inputs =)
3. Place cursor on line 10 ({ below outputs =)
4. Compare visual

Expected behavior
Chunk is indicated in both cases

Screenshots
see above

Additional context