bug: error detected while processing CursorMoved Autocommands for "*": Plugin nvim-lightbulb is not installed

[fgheng]

Did you check docs and existing issues?

• I have read all the lazy docs
• I have searched the existing issues of lazy
• I have searched the exsiting issues of the plugin I have a problem with

Neovim version (nvim -v)

0.9.0-dev-484+gb5edea655

Operating system/version

arch linux and mac os

Describe the bug

I want to lazy load plugin "lightblub" on events "InsertEnter" and "CursorMoved".
But while I first open the neovim without install any plugins, an error message occured 'error detected while processing CursorMoved Autocommands for "*": Plugin nvim-lightbulb is not installed'

I think this is caused by loading plugin without detecting whether it is installed.

Steps To Reproduce

1. nvim -u repo.lua, repo.lua will write below

Expected Behavior

Install plugin firstly and then loaded it if the plugin is not installed.

Repro

-- DO NOT change the paths and don't remove the colorscheme
local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs({ "config", "data", "state", "cache" }) do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  vim.fn.system({
    "git",
    "clone",
    "--filter=blob:none",
    "--single-branch",
    "https://github.com/folke/lazy.nvim.git",
    lazypath,
  })
end
vim.opt.runtimepath:prepend(lazypath)

-- install plugins
local plugins = {
  "folke/tokyonight.nvim",
  -- add any other plugins here
{
    "kosayoda/nvim-lightbulb",
    config = true,
    event = {"InsertEnter", "CursorMoved"}
}

}
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

vim.cmd.colorscheme("tokyonight")
-- add anything else here