Using _fzf_complete with zsh _alternative

[njdan5691]

• Category
  • fzf binary
  • fzf-tmux script
  • Key bindings
  • [ x] Completion
  • Vim
  • Neovim
  • Etc.
• OS
  • [x ] Linux
  • Mac OS X
  • Windows
  • Windows Subsystem for Linux
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• Shell
  • bash
  • [ x] zsh
  • fish

[njdan5691]

zsh 5.0.2 (x86_64-redhat-linux-gnu)
fzf 0.17.5 (b46227d)
CentOS Linux release 7.6.1810 (Core)

This is my completion function

#compdef dummy

_fzf_dummy_names() {
  _fzf_complete "--reverse" "$@" < <(
    echo "one"
    echo "two"
    echo "three"
  )
}

_alternative 'names:dummy name:_fzf_dummy_names'

Looks like it mostly works, fzf is running with my selection, but after a selection is made
I see

_fzf_complete:13: read-only variable: LBUFFER

and the selection is not returned to my prompt.

[roachsinai]

Same error when use zle -N _fzf_complete to complete some executable.