plugin loaded check was break when calls plugin load multi times.

[kuuote]

Describe the bug

plugin loaded check was break when calls plugin load multi times.

Provide a minimal vimrc with less than 50 lines to reproduce

set rtp+=/path/to/github.com/vim-denops/denops.vim

function s:reload()
  call denops#plugin#load('a', expand('<script>:h') .. '/a.ts')
  " 0
  echo denops#plugin#is_loaded('a')
endfunction

function s:init()
  call denops#plugin#load('a', expand('<script>:h') .. '/a.ts')
  " 1
  autocmd User DenopsPluginPost:a echo denops#plugin#is_loaded('a')
  autocmd User DenopsPluginPost:a call s:reload()
endfunction

autocmd User DenopsReady call s:init()

a.ts is any plugin. for example:

export function main() {
  console.log("hello");
}

How to reproduce the problem from Vim startup

1. Place vimrc and a.ts to same directory.

2. vim -Nu vimrc or nvim -u vimrc

Expected behavior

display 1 and 1

Actual behavior

display 1 and 0

Your environment

• OS: Linux horizon-bridge 6.9.8-arch1-1 #1 SMP PREEMPT_DYNAMIC Fri, 05 Jul 2024 22:11:24 +0000 x86_64 GNU/Linux
• Deno version: deno 1.44.4 (release, x86_64-unknown-linux-gnu)
• Vim/Neovim version: VIM - Vi IMproved 9.1 (2024 Jan 02, compiled Jul 9 2024 08:24:57)
• Denops version: 09e64956c2946bba0a060d0a0aaddde106753bd9