LunarVim's color scheme doesn't highlight differences within a line in diff mode

[creiterer]

Problem description

Using LunarVim's default color scheme lunar in diff mode (e.g., lvim -d file1.c file2.c) doesn't highlight differences within a line.
Diff with color scheme lunar:

Diff with color scheme default:

As the screenshots show, the different strings in the printf are not highlighted with color scheme lunar.

LunarVim version

release-1.3/neovim-0.9-f74046d1

Neovim version (>= 0.9.0)

NVIM v0.9.1

Terminal name

Windows Terminal, Version: 1.16.10262.0

Operating system/version

Ubuntu 22.04.2 LTS on WSL2

Steps to reproduce

No response

Screenshots

No response

[creiterer]

A workaround is to manually configure the colors used for diffs as described here.
Currently, I have the following in my config.lua:

lvim.autocommands = {
    {
	{ "ColorScheme" },
	{
	    pattern = "*",
	    callback = function()
	        vim.api.nvim_set_hl(0, "DiffAdd", { bg = "#1c444a", underline = false, bold = false })
	        vim.api.nvim_set_hl(0, "DiffDelete", { bg = "#801919", underline = false, bold = false })
	        vim.api.nvim_set_hl(0, "DiffChange", { bg = "#1d2739", underline = false, bold = false })
	        vim.api.nvim_set_hl(0, "DiffText", { bg = "#3c4e77", underline = false, bold = false })
	    end,
	},
    },
}