Did you see that stat about how many league minutes the PSG players had played leading up to the first leg?
Zaire-Emery 88%, Vitinha 74%, Pacho 68%, Hakimi 51%, Kvaratskhelia 49%, Mendes 46%, Doue 43%, Neves 42%, Dembele 34%, Marquinhos 32%.
It's no wonder they can be so high energy in the Champions League, they basically function like a shark and are half asleep most of the time. It's a big advantage over PL clubs in Europe at the top end when you can do that. Similar but lesser extent for Bayern.