Doesn't work for `GDScript` files

Describe the bug Besides working in every other filetype I've opened, I cannot get this to work in *.gd files.

I've double checked that I have lsp and treesitter installed and configured for GDScript.

To Reproduce Unsure of what's causing the issue, so not able to provide instructions.

I'm running

MacOS 12.3
neovim@0.8.2

Minimal init.lua:

require("packer").startup(function(use)
    use("RRethy/vim-illuminate")
    -- end packer config
    if packer_bootstrap then
        require("packer").sync()
    end
end)

-- setup illuminate
require('illuminate').configure({
    -- providers: provider used to get references in the buffer, ordered by priority
    providers = {
        'lsp',
        'treesitter',
        'regex',
    },
    -- delay: delay in milliseconds
    delay = 100,
    -- filetype_overrides: filetype specific overrides.
    -- The keys are strings to represent the filetype while the values are tables that
    -- supports the same keys passed to .configure except for filetypes_denylist and filetypes_allowlist
    filetype_overrides = {},
    -- filetypes_denylist: filetypes to not illuminate, this overrides filetypes_allowlist
    filetypes_denylist = {
        'dirbuf',
        'dirvish',
        'fugitive',
    },
    -- filetypes_allowlist: filetypes to illuminate, this is overridden by filetypes_denylist
    -- You must set filetypes_denylist = {} to override the defaults to allow filetypes_allowlist to take effect
    filetypes_allowlist = {},
    -- modes_denylist: modes to not illuminate, this overrides modes_allowlist
    -- See `:help mode()` for possible values
    modes_denylist = {},
    -- modes_allowlist: modes to illuminate, this is overridden by modes_denylist
    -- See `:help mode()` for possible values
    modes_allowlist = {},
    -- providers_regex_syntax_denylist: syntax to not illuminate, this overrides providers_regex_syntax_allowlist
    -- Only applies to the 'regex' provider
    -- Use :echom synIDattr(synIDtrans(synID(line('.'), col('.'), 1)), 'name')
    providers_regex_syntax_denylist = {},
    -- providers_regex_syntax_allowlist: syntax to illuminate, this is overridden by providers_regex_syntax_denylist
    -- Only applies to the 'regex' provider
    -- Use :echom synIDattr(synIDtrans(synID(line('.'), col('.'), 1)), 'name')
    providers_regex_syntax_allowlist = {},
    -- under_cursor: whether or not to illuminate under the cursor
    under_cursor = true,
    -- large_file_cutoff: number of lines at which to use large_file_config
    -- The `under_cursor` option is disabled when this cutoff is hit
    large_file_cutoff = nil,
    -- large_file_config: config to use for large files (based on large_file_cutoff).
    -- Supports the same keys passed to .configure
    -- If nil, vim-illuminate will be disabled for large files.
    large_file_overrides = nil,
    -- min_count_to_highlight: minimum number of matches required to perform highlighting
    min_count_to_highlight = 1,
    -- should_enable: a callback that overrides all other settings to
    -- enable/disable illumination. This will be called a lot so don't do
    -- anything expensive in it.
    should_enable = function(bufnr) return true end,
    -- case_insensitive_regex: sets regex case sensitivity
    case_insensitive_regex = false,
})

Output from :IlluminateDebug

buf_should_illuminate 8 true
config {
  case_insensitive_regex = false,
  delay = 100,
  filetype_overrides = {},
  filetypes_allowlist = {},
  filetypes_denylist = { "dirbuf", "dirvish", "fugitive" },
  min_count_to_highlight = 1,
  modes_allowlist = {},
  modes_denylist = {},
  providers = { "lsp", "treesitter", "regex" },
  providers_regex_syntax_allowlist = {},
  providers_regex_syntax_denylist = {},
  should_enable = <function 1>,
  under_cursor = true
}
started true
provider table: 0x0101bb6440 treesitter
`termguicolors` false

Expected behavior Illuminate should work in GDScript files

RRethy / vim-illuminate

Doesn't work for `GDScript` files #184