In the Champions League, Real Madrid, in addition to luck, also has the support of the referee, because this team often plays as champions, so in some controversial issues they get an advantage, even as it was in the cancelled penalty of Alvarez, in my opinion it is stupid to cancel such a penalty... So in order to beat Real Madrid, you need to be not only stronger than them. You also need to take into account other circumstances that can affect the result and in the case of Real Madrid, it is not only luck.
Seriously. Nobody will view it the way you did. Sometimes the action in which the ref uses some matches makes people think he supports the other opponents that they see win the match at the moment. Nobody will think about the other way around and how the match went. However, I observe one thing about Real Madrid this season: even as they are not in their best form, they are managing to win many of their matches in the Champions League.
Should I say lucky, or do they struggle to win the matches? But all I know is that they have been trying so hard to see that they succeed in the Champions League competition. However, everything that has been done can’t be undone. Whether the ref was in favour of any mentioned team, there is nothing to do about that.
One thing that you need to know is that referees are human beings so you don't expect them to be hundred percent perfect that is why VAR is there to help the ref out and even some decisions taken by VAR does not even go well with some people, so I don't personally think that no ref will intentionally give a decision that will favour one team by because that will mean that the ref is biased and will bring the entire game to disrepute.
Every referee that you see officiating in matches has gone through different levels of training and has passed through the regulatory processes involved in the awarding of the refereeing licence so each coach is fully aware of their role as a judge in the field of play knowing that there is a regulatory body watching