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Normally, I don't like the idea of a player returning after leaving a team. But Mane is a player who gained value with Liverpool and it is a fact that he did not succeed in Germany. He also started to get older. That's why he may be happier if he returns.
Of course, we haven't seen any serious transfer speculation about this yet, only football commentators are talking about it
There have been cases where one player was sold to another team but in the next few seasons returning to his old team would only see him leave more quickly than before. They will no longer find his best form in his old team due to maybe different strategies and visions of the game, but Mane will probably be different because there are many old friends who still play for Liverpool today.
I don't know how likely it is that Liverpool will sign Mane again from Bayern Munich, but I don't think it will ever happen again. Mane is more likely to go to the Arab Pro League, but there is no certainty about his future.