How many times have we had a player breaking free only for the ref to blow up because a defender fell over? It happens atleast once every few weeks or something, Villa just have the hilarious money shot of the ball hitting the net when the goal would have won them a CL place.
The problem is if it WAS a soft foul, VAR don't intervene and a goal is given regardless due to the 'clear and obvious' ruling. It's a daft system but the ref cannot be blamed imo.