Yeah, they changed the default colorscheme in neovim at some point in the last year or so. I have an extremely minimal config and don't even use syntax highlighting or tab completions but I could not get it to render the way it used to. I wasted at least 30 minutes on this for absolutely no good reason. So I git bisected, made my own build (which took maybe 10-15 minutes) and will likely never upgrade neovim again.