GDExtension - get_instance_id seems to return invalid IDs

I'm posting this as i'm having some issues porting a godot 3 project because of it
basically, to guarantee I am only holding valid references, I use instance ids to make sure the references are valid
however it seems like currently "UtilityFunctions::is_instance_id_valid" will always return false for the id returned by get_instance_id of a node even for valid node references. And I checked, the ID itself seems to be wrong as calling "UtilityFunctions::instance_from_id" causes a crash as well