How to test:
1)Fresh install recalbox onto a Pi 3B.
2)Add Mario 3 ROM to game list.
3)Start Mario 3 game and press select button to move the little red arrow. It will make a sound as it moves.
4)Press Hotkey + B and use that menu to write a savestate (doing it other ways will not reproduce the bug)
5)Use that green Retroarch menu you're in to restart the game.
5)press select button to move the little red arrow. It will make a sound way after it moves, and you will notice the awful audio lag.