bug: Window doesn't show for remapped registers

[NotNullBool]

Did you check docs and existing issues?

• [X] I have read all the which-key.nvim docs
• [X] I have searched the existing issues of which-key.nvim
• [X] I have searched the existing issues of plugins related to this issue

Neovim version (nvim -v)

NVIM v0.9.2

Operating system/version

Debian 12

Describe the bug

When using a remap on a register ending with an operator like : "_d

Same happens using registers like "+y

Which key window fails to popup unlike when I am typing it manually.

Steps To Reproduce

1. Open init.lua file
2. Set a keymap like this keymap.set({'v','n'}, "<leader>d", "\"_d",{ desc = "Void delete", noremap = true})
3. load keymap
4. which key will not popup on press

Expected Behavior

The operator window should popup even with register

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",
  { "folke/which-key.nvim", config = true },
  -- add any other plugins here
}
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

vim.cmd.colorscheme("tokyonight")
-- add anything else here

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