I don't want to say too much on this subject, but I would note Guardiola has changed, as a character, in the last few years.
Gone, it seems, is the intensity that burned him out at other clubs. I think Guardiola, of today, would handle Sané differently.
An intense Guardiola and a young confused Sané (with the pressure of world potential, much advice from family and national threats on his plate) was a powder keg/ bad mix. I can't recall Guardiola manhandling his players in recent times as he did with Sané back then.
Both are older now and there's no hate, as far as I know, between them.
I wouldn't be surprised if it happened.