### 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
GeometryInstanceGLES3 *ginstance = static_cast<GeometryInstanceGLES3 *>(p_geometry_instance);
	ERR_FAIL_NULL(ginstance);
	GeometryInstanceSurface *surf = ginstance->surface_caches;
	while (surf) {
		GeometryInstanceSurface *next = surf->next;
		geometry_instance_surface_alloc.free(surf);
		surf = next;
	}
	memdelete(ginstance->data);
	geometry_instance_alloc.free(ginstance);
}
void RasterizerSceneGLES3::GeometryInstanceGLES3::_mark_dirty() {
	if (dirty_list_element.in_list()) {
		return;
	}
	
	GeometryInstanceSurface *surf = surface_caches;
	while (surf) {
		GeometryInstanceSurface *next = surf->next;
		RasterizerSceneGLES3::get_singleton()->geometry_instance_surface_alloc.free(surf);
		surf = next;
	}
	surface_caches = nullptr;
	RasterizerSceneGLES3::get_singleton()->geometry_instance_dirty_list.add(&dirty_list_element);
}
void RasterizerSceneGLES3::GeometryInstanceGLES3::set_use_lightmap(RID p_lightmap_instance, const Rect2 &p_lightmap_uv_scale, int p_lightmap_slice_index) {