bug: Unable to update plugin due to helptag conflict

[mimikun]

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• I have read all the lazy.nvim docs
• I have searched the existing issues of lazy.nvim
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Neovim version (nvim -v)

NVIM v0.10.0-dev-468292d

Operating system/version

Windows 11 Pro 23H2 / Ubuntu 22.04.3

Describe the bug

vim-jp/vimdoc-ja may fail to update.
This is a plugin that contains vim help files translated into Japanese.
It is believed that this issue is caused by unconditionally updating the plugin's distribution file.
Ref: vim-jp/vimdoc-ja#279

Steps To Reproduce

1. Run nvim -u repro.lua
2. Run :Lazy update
3. Failed plugin update

Expected Behavior

Successful plugin update
no error occurs

Repro

-- DO NOT change the paths and don't remove the colorscheme
local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs({ "config", "data", "state", "cache" }) do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", lazypath, })
end
vim.opt.runtimepath:prepend(lazypath)

-- install plugins
local plugins = {
  "folke/tokyonight.nvim",
  -- add any other plugins here
  "vim-jp/vimdoc-ja",
}
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

vim.cmd.colorscheme("tokyonight")
-- add anything else here
vim.opt.helplang = { "ja", "en" }

[folke]

vim-jp/vimdoc-ja#279 (comment)