Cannot enable inlay hints about rust-tools.nvim HOT 3 OPEN

local handlers = {
  function(server_name)
    require('lspconfig')[server_name].setup {
      capabilities = capabilities,
      on_attach = on_attach,
      settings = servers[server_name],
      filetypes = (servers[server_name] or {}).filetypes,
    }
  end,
  ["rust_analyzer"] = function()              -- This will "skip" setting up rust_analyzer
  end
}

mason_lspconfig.setup_handlers(handlers)

local rt = require("rust-tools")

rt.setup({
  server = {
    on_attach = function(_, bufnr)
      on_attach(_, bufnr)   -- This calls your default on_attach function, so every keymap will be loaded correctly
      vim.keymap.set("n", "<leader>ca", require("rust-tools.code_action_group").code_action_group, { buffer = bufnr})
      vim.keymap.set("n", "<leader>ha", require("rust-tools.hover_actions").hover_actions, { buffer = bufnr})
    end,
  },
})