When last did you see Mbape play the position of striker in PSG, he is not used to such pattern and that's why lifts often don't see them playing 3 forward players in most of their games, it's most likely 2 wingers and the rest are been spread in midfield and center back but Real Madrid already has the best players in those key wings and they have played important role in Real Madrid , yet the manager want to use them and they have to forcefully used Mbape as striker, that can't yield good result in short term until he is used to it.
Too much expectations breaks heart when you finally get into reality, so many excuses in the season Mbape rejected Real Madrid and I see people using Mbape as excused most especially when Benzema left the team but he is right here in time to take shine that position but it seems the same people has choose to castigate the same guy they wanted badly in the last season, you can't give what you don't have.
Well, you see that Mbappe has problems scoring goals not only in Real, he also had a bad end of the season in PSG and played badly at the Euro, and nothing has changed in Real, he is still going through some kind of crisis, maybe it is connected with the long process of leaving PSG, but a lot of time has passed since then and he should have recovered after that. Sometimes it happens that a forward changes the championship and can no longer score as much as before, but in the case of Mbappe we see that this is not only in La Liga, he is now having difficulties in the national team too.