Unexpected behavior on <C-o>

[lambdalisue]

:e README.md
:e LICENSE
:e .
<C-o>

Expected: Back to LICENSE
Actual: Back to README.md

[lambdalisue]

The initial version was

" Disable netrw
let g:loaded_netrw             = 1
let g:loaded_netrwPlugin       = 1
let g:loaded_netrwSettings     = 1
let g:loaded_netrwFileHandlers = 1

augroup my-fern-hijack
  autocmd!
  autocmd BufEnter * ++nested call s:hijack_directory()
augroup END

function! s:hijack_directory() abort
  let path = expand('%:p')
  if !isdirectory(path)
    return
  endif
  bwipeout %
  execute printf('Fern %s', fnameescape(path))
endfunction

In this case, bwipeout % was required to remove somehow produced buffer.

The current version disable netrw by removing FileExplorer autocmd and it seems that avoid unwilling buffer produce so bwipeout % is no longer required.