First goal was a loss of control of the ball, touch or pass (whatever it was). We've seen Chiellini do that a million times but get lucky, now and again not. You expect better from Benatia but there it is.
Second goal yeah Messi is Messi but Benatia at that point had morphed into something resembling Ogbonna-levels of stand and watch. He does also do this a lot. Bonucci also does this stand off and watch technique, then he flicks a leg out. At that point it was already 2-0 and you're in a world of pain away at Barcelona so it's all a bit relative.