Current position has to be stored somewhere. I was wondering if maybe the current Fid was used to index the running order, but I realised that would 'fail' on duplicates. However, I also remembered that duplicates are quirky anyway - they always get removed during shuffle, and re-inserted during unshuffle, so I checked...

If you have 1 track duplicated in a playlist, and the player is playing one of them at the point of shutdown, it will continue to play the correct one after power up.

The search continues...