The colors have nothing to do with your screenshot, why? about oxocarbon.nvim

[soda-zero]

Had the same issue, apparently treesitter made some breaking changes, check https://www.reddit.com/r/neovim/comments/y5rofg/recent_treesitter_update_borked_highlighting/

This fix worked for me
https://gist.github.com/jdrouhard/dccbb692e901d5e0a00a3a4c126079c6

[shaunsingh]

I added support for the new tree-sitter highlights. The base colors of the theme and syntax mapping have changed slightly to align better with the official ibm carbon, but I've also updated the screenshots accordingly

[Herz3h]

I have same issue in kitty + nvim 0.9.4 I even removed nvim-treesitter plugin:

See this simple rust file:

My init.lua file:

-- Theme
vim.cmd('syntax enable')
vim.opt.termguicolors = true

local plugins = {
    -- THEMES
    { 'nyoom-engineering/oxocarbon.nvim' },
}


-- LAZY.NVIM
local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  vim.fn.system({
    "git",
    "clone",
    "--filter=blob:none",
    "https://github.com/folke/lazy.nvim.git",
    "--branch=stable", -- latest stable release
    lazypath,
  })
end
vim.opt.rtp:prepend(lazypath)

require("lazy").setup(plugins, opts)

-- THEMES
vim.opt.background = "dark"
vim.cmd("colorscheme oxocarbon")