Old APIs had a layer between AkSoundEngine and project scripts that supported GetListenerPosition from a listener ID, which has been refactored to require a UnityEngine.GameObject (even though it's still named in_uIndex in the signature of GetListenerPosition).
Is it no longer possible to retrieve the listener position directly from AkSoundEngine.AK_DEFAULT_LISTENER_OBJ? This API still returns a ulong, and I haven't been able to find an API that converts ulong to UnityEngine.GameObject.