why <c-c> cann't be used in insert mode?

[fvrings]

I have set <c-c> as my prefix key in org file like this:

      { '<c-c>', '<nop>', mode = 'i', ft = 'org' },
      { '<c-c><c-l>', '<c-o><c-c><c-l>', mode = 'i', ft = 'org' },
      { '<c-c><c-h>', '<c-o><c-c><c-h>', mode = 'i', ft = 'org' },

When I press <c-c><c-l> in insert mode it should invoke org_do_demote in normal mode.
But instead it just return to normal mode and does nothing.
Here is reproduce config:

vim.loader.enable()
local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not (vim.uv or vim.loop).fs_stat(lazypath) then
	local lazyrepo = "https://github.com/folke/lazy.nvim.git"
	local out = vim.fn.system({ "git", "clone", "--filter=blob:none", "--branch=stable", lazyrepo, lazypath })
	if vim.v.shell_error ~= 0 then
		vim.api.nvim_echo({
			{ "Failed to clone lazy.nvim:\n", "ErrorMsg" },
			{ out, "WarningMsg" },
			{ "\nPress any key to exit..." },
		}, true, {})
		vim.fn.getchar()
		os.exit(1)
	end
end
vim.opt.rtp:prepend(lazypath)
require("lazy").setup({
	spec = {
		{
			"nvim-orgmode/orgmode",
			ft = "org",
			keys = {
				{ "<c-c>", "<nop>", mode = "i", ft = "org" },
				{ "<c-c><c-l>", "<c-o><c-c><c-l>", mode = "i", ft = "org" },
				{ "<c-c><c-h>", "<c-o><c-c><c-h>", mode = "i", ft = "org" },
			},
			opts = {
				mappings = {
					prefix = "<c-c>",
					org = {
						org_do_promote = "<c-c><c-h>",
						org_do_demote = "<c-c><c-l>",
					},

					org_return_uses_meta_return = true,
				},
			},
		},
	},
})

[fvrings]

according to vim.keymap.set docs:

      • {opts}  (`table?`) Table of |:map-arguments|. Same as
                |nvim_set_keymap()| {opts}, except:
                • {replace_keycodes} defaults to `true` if "expr" is `true`.

                Also accepts:
                • {buffer}? (`integer|boolean`) Creates buffer-local mapping,
                  `0` or `true` for current buffer.
                • {remap}? (`boolean`, default: `false`) Make the mapping
                  recursive. Inverse of {noremap}.

remap is false by default.