### 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 (light_storage->light_omni_get_shadow_mode(base) == RS::LIGHT_OMNI_SHADOW_CUBE) {
				render_texture = light_storage->get_cubemap(shadow_size / 2);
				render_fb = light_storage->get_cubemap_fb(shadow_size / 2, p_pass);
				light_projection = light_storage->light_instance_get_shadow_camera(p_light, p_pass);
				light_transform = light_storage->light_instance_get_shadow_transform(p_light, p_pass);
				render_cubemap = true;
				finalize_cubemap = p_pass == 5;
				atlas_fb = light_storage->shadow_atlas_get_fb(p_shadow_atlas);
				atlas_size = shadow_atlas_size;
				if (p_pass == 0) {
					_render_shadow_begin();
				}
			} else {
				atlas_rect.position.x += 1;
				atlas_rect.position.y += 1;
				atlas_rect.size.x -= 2;
				atlas_rect.size.y -= 2;
				atlas_rect.position += p_pass * atlas_rect.size * dual_paraboloid_offset;
				light_projection = light_storage->light_instance_get_shadow_camera(p_light, 0);
				light_transform = light_storage->light_instance_get_shadow_transform(p_light, 0);
				using_dual_paraboloid = true;
				using_dual_paraboloid_flip = p_pass == 1;
				render_fb = light_storage->shadow_atlas_get_fb(p_shadow_atlas);
				flip_y = true;
			}
		} else if (light_storage->light_get_type(base) == RS::LIGHT_SPOT) {
			light_projection = light_storage->light_instance_get_shadow_camera(p_light, 0);
			light_transform = light_storage->light_instance_get_shadow_transform(p_light, 0);
			render_fb = light_storage->shadow_atlas_get_fb(p_shadow_atlas);
			flip_y = true;