### Godot version

4.2.dev 5ee983188de97ae027f9b9c1443438063f708a7e

### System information

Windows 10 - Compatibility renderer 

### Issue description

When running a VR project sky contribution is not working in the compatibility renderer:

![image](https://github.com/godotengine/godot/assets/1945449/7aa19569-95c8-41a2-913b-37b81f4728a7)

It is working fine in normal mode. Can be worked around by setting sky contribution to 0 and providing an ambient color.

### Steps to reproduce

Try any project with a proper sky setup in XR, just switch to compatibility renderer.

### Minimal reproduction project

I'll try and create an MVP soon that can be used without XR hardware, but for now this can be used:
https://github.com/BastiaanOlij/godot_openxr_demo
angular_diameter = Math::tan(Math::deg_to_rad(angular_diameter));
				} else {
					angular_diameter = 0.0;
				}
				sky_light_data.size = angular_diameter;
				sky_globals.directional_light_count++;
				if (sky_globals.directional_light_count >= sky_globals.max_directional_lights) {
					break;
				}
			}
		}
		
		bool light_data_dirty = false;
		
		
		if (sky_globals.directional_light_count != sky_globals.last_frame_directional_light_count) {
			light_data_dirty = true;
			for (uint32_t i = sky_globals.directional_light_count; i < sky_globals.max_directional_lights; i++) {
				sky_globals.directional_lights[i].enabled = false;
				sky_globals.last_frame_directional_lights[i].enabled = false;
			}
		}
		if (!light_data_dirty) {
			for (uint32_t i = 0; i < sky_globals.directional_light_count; i++) {
				if (sky_globals.directional_lights[i].direction[0] != sky_globals.last_frame_directional_lights[i].direction[0] ||
						sky_globals.directional_lights[i].direction[1] != sky_globals.last_frame_directional_lights[i].direction[1] ||
						sky_globals.directional_lights[i].direction[2] != sky_globals.last_frame_directional_lights[i].direction[2] ||
						sky_globals.directional_lights[i].energy != sky_globals.last_frame_directional_lights[i].energy ||
						sky_globals.directional_lights[i].color[0] != sky_globals.last_frame_directional_lights[i].color[0] ||
						sky_globals.directional_lights[i].color[1] != sky_globals.last_frame_directional_lights[i].color[1] ||