NixOS letter issue

[initial-mockingbird]

What Operating System(s) are you running on?

Linux Wayland

Which Wayland compositor or X11 Window manager(s) are you using?

gnome

WezTerm version

20240203-110809-5046fc22

Ask your question!

I'm trying to set-up wezterm via home manager. Currently, this is my configuration:

programs.wezterm = {
    enable = true;
    enableBashIntegration = true;
    package = pkgs.wezterm;
    extraConfig = ''
     -- Pull in the wezterm API
    local wezterm = require 'wezterm'

    -- This will hold the configuration.
    local config = wezterm.config_builder()

    -- This is where you actually apply your config choices

    -- For example, changing the color scheme:
    config.color_scheme = 'Catppuccin Frappe'

    config.background = {
      {
        source = {File = '/home/dan/.config/home-manager/rio/background_pics/tex_dialogue_common_cg13_10_03.png'},
        vertical_align = 'Middle',
        horizontal_align = 'Center',

      },
    }
    config.xcursor_theme = "Adwaita"


    -- and finally, return the configuration to wezterm
    return config

      '';
  };

Nevertheless after switching, and opening wezterm, I'm greeted with the following window:

No background image, and just blocks for letters. What am I missing?

[refaelsh]

I have exactly the same issue with a very similar NixOS config. It started happening a few days ago.