Recipe for disable per filetype doesn't work due to empty vim.bo.filetype

[firstian]

I tried the example in the recipe to try and disable completion by file type, but it was very flaky. More often than not it doesn't work because vim.o.filetype is empty. My code looks like this:

  enabled = function()
    local enabled_filetype = {
      "python",
      "javascript",
      "javascriptreact",
      "typescript",
      "typescriptreact",
      "rust",
    }
    -- print("filetype: " .. vim.bo.filetype)
    if vim.tbl_contains(enabled_filetype, vim.bo.filetype) then
      -- print("contains" .. vim.bo.filetype .. ".")
      return true
    end
    -- print("not contains " .. vim.bo.filetype .. ".")
    return false
  end,

However, when I run :lua print(vim.bo.filetype) the value is populated. Is this a race condition of some sort? I'm using LazyVim and nvim v0.11.2.