### Godot version

4.1.1

### System information

windows 11, mobile renderer

### Issue description

On Mobile Vulkan renderer, the clear color is 50% lighter than expected

See steps to reproduce and Minimal reproduction project below.

The box and background have the same color on Forward+ and compatibility, but not on Mobile
happens also in runtime on exported project, not only in editor preview

Images of the same scene from
compatibility:
![compatibility](https://github.com/godotengine/godot/assets/11915378/a874fa86-c16f-43ef-aed7-c2066b770ac1)
Forward+:
![forward](https://github.com/godotengine/godot/assets/11915378/e416f9a6-dfd4-4c47-bbc2-b552ca58f83c)
Mobile:
![mobile](https://github.com/godotengine/godot/assets/11915378/e28e2db8-f7c3-47e2-8c0a-44ce937c9270)


### Steps to reproduce

 - add a CSGBox3D with "unshaded" shading, and albedo of #545454
 - add environment with Background = Custom color and color of #545454

Box and background are not the same color

### Minimal reproduction project

[bg_color.zip](https://github.com/godotengine/godot/files/12174822/bg_color.zip)

p_render_data->render_info->info[RS::VIEWPORT_RENDER_INFO_TYPE_VISIBLE][RS::VIEWPORT_RENDER_INFO_OBJECTS_IN_FRAME] = p_render_data->instances->size();
	}
	if (is_reflection_probe) {
		uint32_t resolution = light_storage->reflection_probe_instance_get_resolution(p_render_data->reflection_probe);
		screen_size.x = resolution;
		screen_size.y = resolution;
		framebuffer = light_storage->reflection_probe_instance_get_framebuffer(p_render_data->reflection_probe, p_render_data->reflection_probe_pass);
		if (light_storage->reflection_probe_is_interior(light_storage->reflection_probe_instance_get_probe(p_render_data->reflection_probe))) {
			p_render_data->environment = RID(); 
		}
		reverse_cull = true;
		using_subpass_transparent = true; 
		using_subpass_post_process = false; 
	} else if (rb_data.is_valid()) {
		
		screen_size = p_render_data->render_buffers->get_internal_size();
		if (rb->get_scaling_3d_mode() != RS::VIEWPORT_SCALING_3D_MODE_OFF) {
			
			using_subpass_post_process = false;
		} else if (p_render_data->environment.is_valid() && (environment_get_glow_enabled(p_render_data->environment) || RSG::camera_attributes->camera_attributes_uses_auto_exposure(p_render_data->camera_attributes) || RSG::camera_attributes->camera_attributes_uses_dof(p_render_data->camera_attributes))) {
			
			using_subpass_post_process = false;
		}
		if (scene_state.used_screen_texture || scene_state.used_depth_texture) {
			
			using_subpass_transparent = false;
			using_subpass_post_process = false;
		}
		if (using_subpass_post_process) {