Undefined variable: g:fern#renderers after defining it, but only sometimes

[OutOfBounds99]

I am using Neovim with Lazy through WSL.
This plugin works, but only sometimes. When it doesn't work, neither does Fern. It's very random whether it works or not.

Config:

-- fern.lua
return {
  {
    'lambdalisue/vim-fern',
    config = function()
      vim.cmd [[
        function! s:init_fern() abort
        autocmd BufEnter <buffer> call feedkeys("\<Plug>(fern-action-hidden)"
        nmap <buffer> r <Plug>(fern-action-rename)
        nmap <buffer> h <Plug>(fern-action-leave)
        nmap <buffer> n <Plug>(fern-action-new-path)
        nmap <buffer> D <Plug>(fern-action-remove)
        nmap <buffer> b <Plug>(fern-action-open:split)
        nmap <buffer> v <Plug>(fern-action-open:vsplit)
        endfunction

        augroup fern-custom
        autocmd! *
        autocmd FileType fern call s:init_fern()
        augroup END
        ]]
    end,
  },
  'lambdalisue/vim-fern-hijack',
  'lambdalisue/vim-fern-git-status',
  'lambdalisue/vim-nerdfont',
  {
    'lambdalisue/vim-fern-renderer-nerdfont',
    config = function()
      vim.cmd 'let g:fern#renderer = "nerdfont"'
    end,
  },
}

Errors:

Vim(let):E121: Undefined variable: g:fern#opener
Error in BufEnter Autocommands for "*"..function <SNR>20_hijack_directory[6]..fern#internal#command#fern#command[124]..BufEnter Autoc
ommands for "*"..function <SNR>20_hijack_directory[6]..fern#internal#command#fern#command[122]..script /home/[USERNAME]/.local/share/nvim
/lazy/vim-fern/autoload/fern/logger.vim:
line   87:
E121: Undefined variable: g:fern#DEBUG

Failed to source `/home/[USERNAME]/.local/share/nvim/lazy/vim-fern-renderer-nerdfont/plugin/fern_renderer_nerdfont.vim`

vim/_editor.lua:0: /home/[USERNAME]/.config/nvim/init.lua..nvim_exec2() called at /home/[USERNAME]/.config/nvim/init.lua:0[1]../home/[USERNAME]/.
local/share/nvim/lazy/vim-fern-renderer-nerdfont/plugin/fern_renderer_nerdfont.vim, line 6: Vim(call):E121: Undefined variable: g:fer
n#renderers

# stacktrace:
  - vim/_editor.lua:0 _in_ **cmd**
  - ~/.config/nvim/init.lua:277

EDIT:
I have since removed autocmd BufEnter <buffer> call feedkeys("\<Plug>(fern-action-hidden), as it causes Fern . -drawer to not work.

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[lambdalisue]

1. It should be reported on https://github.com/lambdalisue/vim-fern instead, while vim-glyph-palette is not only for vim-fern
2. I'm not sure but it seems bug on Neovim itself while g:fern#opener, g:fern#renderer, or g:fern#DEBUG should be automatically defined when accessed to g:fern#... (This is Vim/Neovim's spec)

In short, I've no idea while vim-fern itself seems properly use the Vin/Neovim autoload feature. Not sure but maybe lazy.nvim does something unusual?