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.
I can agree on luck being on Real Madrid's side in a Champions League match, not for them to find favor on the referee's side because many times have Ancelotti expressed frustration over the team-packed match schedules. Real Madrid has played 22 matches in 71 days, with an average of one game every 3 days.
The tight match schedule has led to player burnout and fatigue in matches easily. Ancelotti is warning over the situation not to repeat again, to avoid Real Madrid not being available in a match as planned.
Link to information:
https://worldsoccertalk.com/news/carlo-ancelotti-issues-ultimatum-to-la-liga-over-real-madrids-packed-schedule-and-lack-of-rest/This complaint from Ancelotti, makes it feel like no team has special treatment from the referee or the organizers of the Champions League