<Plug>(fern-action-ex=) should include fnnameescape perhaps?

I have the following mapping `nmap <buffer> O <Plug>(fern-action-ex=)Open<CR>``
Inspection of the ":map O" returns

`n  O           *@<Cmd>execute "Open " .. expand('<cfile>:p')<CR>`

Would be more appropriate expanding to `n  O           *@<Cmd>execute "Open " .. fnameescape(expand('<cfile>:p'))<CR>` ? 
Often, full filepaths have whitespaces in Windows. 