I think that if a player cannot score a penalty, it may not be his fault but it may be the fault of fate.
When a player could not score a penalty is actually his fault because he was the one that was given the opportunity to play, so there is no two ways about it but however the only thing is that nobody is above making a mistake and fate shouldn't even be the reason because confidence is much higher than fate because without confidence no matter how many times you play you would always loss a lot but is not that having a confidence guarantee your scoring because he was very confidence but is just unfortunate for him that the goalkeeper had already have that direction in mind, so actually confidence only gives you a higher chance of scoring a penalty.
I think it's wrong to call if Mbappe was just unfortunate enough with his penalty. He has missed two penalty in a row, and all of these penalties are important for his club. The big problem is what the hell is wrong with Madrid to let Mbappe to take the penalty? They shouldn't let him took it after he missed it against Liverpool.
A lot of Real Madrid fans were also bashing him for his mistakes, it looks like he never learn about how to shoot. He got paid two digits million yearly, and he should deliver more. I can still understand if he did it only against Liverpool, but against Bilbao?
He was shooting without power, same direction, and easily predicted. I think he should never take pen till the end of season.