Dot operator with functions which put user into insert mode

[SevereOverfl0w]

This looks related to #202 but I don't think this aspect of it was resolved.

Using the setup:

function! CustomChange(type, ...)
  if a:0  " Invoked from Visual mode, use gv command.
    silent exe "normal! gvd"
  elseif a:type == 'line'
    silent exe "normal! '[V']d"
  else
    silent exe "normal! `[v`]d"
  endif

  call feedkeys('i')
endfunction

nmap <silent> <F4> :set opfunc=CustomChange<CR>g@

When doing . on another word after running <F4>iwfoo<ESC> the text under the cursor is not replaced with "foo", but instead foo is inserted where the cursor is.

The same happens for various other feedkeys() I have tried, with different modes.