### 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)

if ((uint32_t)render_list_params.element_count > render_list_thread_threshold && false) {
				
				
				thread_draw_lists.resize(WorkerThreadPool::get_singleton()->get_thread_count());
				RD::get_singleton()->draw_list_begin_split(framebuffer, thread_draw_lists.size(), thread_draw_lists.ptr(), can_continue_color ? RD::INITIAL_ACTION_CONTINUE : RD::INITIAL_ACTION_KEEP, RD::FINAL_ACTION_READ, can_continue_depth ? RD::INITIAL_ACTION_CONTINUE : RD::INITIAL_ACTION_KEEP, RD::FINAL_ACTION_READ);
				WorkerThreadPool::GroupID group_task = WorkerThreadPool::get_singleton()->add_template_group_task(this, &RenderForwardMobile::_render_list_thread_function, &render_list_params, thread_draw_lists.size(), -1, true, SNAME("ForwardMobileRenderSubpass"));
				WorkerThreadPool::get_singleton()->wait_for_group_task_completion(group_task);
				RD::get_singleton()->draw_list_end(RD::BARRIER_MASK_ALL_BARRIERS);
			} else {
				
				RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(framebuffer, can_continue_color ? RD::INITIAL_ACTION_CONTINUE : RD::INITIAL_ACTION_KEEP, RD::FINAL_ACTION_READ, can_continue_depth ? RD::INITIAL_ACTION_CONTINUE : RD::INITIAL_ACTION_KEEP, RD::FINAL_ACTION_READ);
				_render_list(draw_list, fb_format, &render_list_params, 0, render_list_params.element_count);
				RD::get_singleton()->draw_list_end(RD::BARRIER_MASK_ALL_BARRIERS);
			}
			RD::get_singleton()->draw_command_end_label(); 
		}
	}
	if (rb_data.is_valid() && !using_subpass_post_process) {
		RD::get_singleton()->draw_command_begin_label("Post process pass");
		
		RENDER_TIMESTAMP("Tonemap");
		_render_buffers_post_process_and_tonemap(p_render_data);
		RD::get_singleton()->draw_command_end_label(); 
	}
	if (rb_data.is_valid()) {
		_disable_clear_request(p_render_data);
	}
	_render_buffers_debug_draw(p_render_data);
}
void RenderForwardMobile::_render_shadow_pass(RID p_light, RID p_shadow_atlas, int p_pass, const PagedArray<RenderGeometryInstance *> &p_instances, const Plane &p_camera_plane, float p_lod_distance_multiplier, float p_screen_mesh_lod_threshold, bool p_open_pass, bool p_close_pass, bool p_clear_region, RenderingMethod::RenderInfo *p_render_info) {