No plugins from custom.plugins is loaded #176

I have the same problem as described in #34.
I've commented in that issue quite a bit.
To Reproduce
Steps to reproduce the behavior:

1. Add plugins to ~/.config/nvim/lua/custom/plugins.lua
2. Re-start vim or run PackerSync
3. No plugins from custom.plugins is installed

Desktop (please complete the following information):

• OS: macOS 13.2
• Terminal: iTerm2

** Neovim Version **

• Output of running :version from inside of neovim:

NVIM v0.8.3
Build type: Release
LuaJIT 2.1.0-beta3
Compiled by [email protected]

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/opt/homebrew/Cellar/neovim/0.8.3/share/nvim"

My current ~/.config/nvim/lua/custom/plugins.lua: https://github.com/jby/nvim/blob/nvks/lua/custom/plugins.lua

return function(use)
  -- Configure nvim-tree
  use({
    {'nvim-tree/nvim-tree.lua', requires = 'nvim-tree/nvim-web-devicons'},
    config = function()
      require("nvim-tree").setup()
      'nvim-tree/nvim-web-devicons'
    end
  })
  -- Add friendly snippets
  use({
    'rafamadriz/friendly-snippets',
    config = function ()
      require('luasnip.loader.from_vscode').lazy_load()
    end
  })
end