At the beginning of Avengers: Endgame, when the leftover Avengers find Thanos on a planet called "The Garden", we witness the following conversation between them and Thanos,
Natasha: Where are the Stones?
Thanos: Gone, reduced to atoms.
Bruce: You used them two days ago.
Thanos: I used the Stones to destroy the Stones. It nearly killed me. The work is done and always will be. I'm inevitable.
This means that in the current timeline, the Stones are destroyed by Thanos and not recoverable.
Here, what exactly did Thanos do with the Stones? How was he able to do that as he was already weakened by the first snap?
Did he snap again? Did he lose his left ear in that process?