I haven't seen the full Villa - Bayern match and looking only at the game statistics, I was of the impression that Bayern was heavily dominating the game with ball possession of 70% and a significant advantage in shots on goal and that their loss was mostly due to bad luck.
But I've just watched some highlights and it doesn't at all look like Bayern could pose that much of a threat to Villa. They had some chances but so did Villa, and, if anything, it seemed like an even game. And not to mention that Upamecano should've been sent off for that two tactical fouls he committed.
Meanwhile, Bayern's next rival, Eintracht Frankfurt, is beating Besiktas 2-0 in Istambul.