### 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)

return 2.0;
}
RD::DataFormat RenderForwardMobile::_render_buffers_get_color_format() {
	
	return RD::DATA_FORMAT_A2B10G10R10_UNORM_PACK32;
}
bool RenderForwardMobile::_render_buffers_can_be_storage() {
	
	
	return false;
}
RID RenderForwardMobile::_setup_render_pass_uniform_set(RenderListType p_render_list, const RenderDataRD *p_render_data, RID p_radiance_texture, bool p_use_directional_shadow_atlas, int p_index) {
	RendererRD::LightStorage *light_storage = RendererRD::LightStorage::get_singleton();
	RendererRD::TextureStorage *texture_storage = RendererRD::TextureStorage::get_singleton();
	
	ERR_FAIL_INDEX_V(p_index, (int)scene_state.uniform_buffers.size(), RID());
	bool is_multiview = false;
	Ref<RenderBufferDataForwardMobile> rb_data;
	Ref<RenderSceneBuffersRD> rb;
	if (p_render_data && p_render_data->render_buffers.is_valid()) {
		rb = p_render_data->render_buffers;
		is_multiview = rb->get_view_count() > 1;
		if (rb->has_custom_data(RB_SCOPE_MOBILE)) {