if liverpool vs madrid and PSG vs bayern happen then I'm sure Liverpool and PSG will lose. From the big teams that I've watched playing in the UCL this season, we won't have a hard time predicting which teams will advance to the semifinals. Teams like Napoli and Man City are also very potential and we can't get rid of the competition.
It's natural for you to be so sure if these teams meet Liverpool and PSG will lose, because Liverpool and PSG performances in the UCL are inconsistent. But you must not forget one thing in football, anything can happen during the game. What you predict on the table is not necessarily happens on the field as you predict, surprises can happen unexpectedly.
I have watched so many football matches, unexpected things always happen color the game. There are times when the superior team must bow down when they are defeated by a team that is considered weak, there are also incidents that are detrimental to the superior team due to the mainstay player being injured or getting a red card during the match.
I'm not a Liverpool or PSG fan, but I don't take Real Madrid and Bayern Munich lightly. Anyone can predict according to his wishes, but I dare not say Liverpool and PSG will lose to Madrid and Munich.