bug: Unexpected behaviour of "hidden" in combination with "expand"

[metalinspired]

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• I have read all the which-key.nvim docs
• I have updated the plugin to the latest version before submitting this issue
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Neovim version (nvim -v)

0.11.0-dev-1050+g45e319ade

Operating system/version

Kubunut 24.04

Describe the bug

I am using "expand" to dynamically add Harpoon marks to keymap.
This works fine but I wanted to implement functionality to only show first five mappings.
Here I found out that "hidden" is completely ignored.
Then I thought I might as well hide all the Harpoon mark keymaps since I implemented a list of existing marks in the status line.
However, setting "hidden" here prevents which-key from showing up when leader key is pressed and Harpoon mark keymaps do not work.

Steps To Reproduce

Example for first case:

  {
    'folke/which-key.nvim',
    event = 'VimEnter',
    opts = {
      spec = {
         {  
          '<leader>',
          group = 'Harpoon',
          expand = function()
            local harpoon = require 'harpoon'
            local marks = harpoon:list().items
            local ret = {}

            for i, _ in ipairs(marks) do
              ret[i] = {
                tostring(i),
                function() harpoon:list():select(i) end,
                desc = 'Harpoon file ' .. i,
              }
              if i > 1 then
                ret[i]['hidden'] = true
              end
            end

            return ret
          end,
        }
      }
    }
  }

Example for second case:

  {
    'folke/which-key.nvim',
    event = 'VimEnter',
    opts = {
      spec = {
          {
          '<leader>',
          group = 'Harpoon',
          hidden = true,
          expand = function()
            local harpoon = require 'harpoon'
            local marks = harpoon:list().items
            local ret = {}

            for i, _ in ipairs(marks) do
              ret[i] = {
                tostring(i),
                function() harpoon:list():select(i) end,
                desc = 'Harpoon file ' .. i,
              }
            end

            return ret
          end,
        }
      }
    }
  }

Expected Behavior

For first case, to hide only the items where hidden is set.
For second, not to disable which-key showing up when leader key is pressed and for mappings to work.

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