Plugins lazily loaded on keys with an identical mapping in config won't show on first request

[oblitum]

Describe the bug

For nvim-tree to show up for example, I have to type leaderk once for it to be internally loaded by lazy.nvim it seems, only then, typing again leaderk will bring the nvim-tree window up.

I have the same behavior replicated for most other plugins I load by keys.

Which version of Neovim are you using?

NVIM v0.8.1 on ArchLinux

To Reproduce
Steps to reproduce the behavior:

1.  {
        'kyazdani42/nvim-tree.lua', keys = '<leader>k',
        dependencies = 'kyazdani42/nvim-web-devicons',
        config = function()
            vim.cmd [[nnoremap <silent> <leader>k :NvimTreeToggle<cr>]]
        end
    }
   

2. leaderk (won't show anything)
3. leaderk (shows nvim-tree)

Expected Behavior

It should be displayed on first request.