A sensor in the ball and on the line like they use at the World Cup would be an easier solution.I wonder if goalposts could be fitted with a camera that once fitted could withstand the force of a ball hitting the post because it seems to me there has been a rise in cases where goals have been scored from what appears to be balls crossing the outside line of the posts but the current camera's are not able to see the ball properly because it is being blocked by the players body.
I don’t think there are more instances of it. Just far more camera angles, slowed down footage and analysis.