### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

if (shader.is_valid()) {
		const StringName *pr = remap_cache.getptr(p_name);
		if (*pr) {
			r_property = RenderingServer::get_singleton()->shader_get_parameter_default(shader->get_rid(), *pr);
			return true;
		}
	}
	return false;
}
void ShaderMaterial::set_shader(const Ref<Shader> &p_shader) {
	
	
	
	if (shader.is_valid() && Engine::get_singleton()->is_editor_hint()) {
		shader->disconnect("changed", callable_mp(this, &ShaderMaterial::_shader_changed));
	}
	shader = p_shader;
	RID rid;
	if (shader.is_valid()) {
		rid = shader->get_rid();
		if (Engine::get_singleton()->is_editor_hint()) {
			shader->connect("changed", callable_mp(this, &ShaderMaterial::_shader_changed));
		}
	}
	RS::get_singleton()->material_set_shader(_get_material(), rid);
	notify_property_list_changed(); 
	emit_changed();
}
Ref<Shader> ShaderMaterial::get_shader() const {