### 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 (param_cache.has(p_param)) {
		return param_cache[p_param];
	} else {
		return Variant();
	}
}
void ShaderMaterial::_shader_changed() {
	notify_property_list_changed(); 
}
void ShaderMaterial::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_shader", "shader"), &ShaderMaterial::set_shader);
	ClassDB::bind_method(D_METHOD("get_shader"), &ShaderMaterial::get_shader);
	ClassDB::bind_method(D_METHOD("set_shader_parameter", "param", "value"), &ShaderMaterial::set_shader_parameter);
	ClassDB::bind_method(D_METHOD("get_shader_parameter", "param"), &ShaderMaterial::get_shader_parameter);
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "shader", PROPERTY_HINT_RESOURCE_TYPE, "Shader"), "set_shader", "get_shader");
}
void ShaderMaterial::get_argument_options(const StringName &p_function, int p_idx, List<String> *r_options) const {