If Lazio succeeds in taking advantage of Bayern Munich instability in the second leg, of course Lazio will create an unexpected surprise. But I see that Bayern Munich have managed to get through their difficult times in the Bundesliga where they have returned to winning ways. For the second leg, Bayern Munich are still very much favored because they are playing at home and also in terms of strength they are still very favorites to beat Lazio.
If you look at Munich's last match against Leipzig, I think Lazio still has a chance to qualify for the next round. They are already 1 goal ahead and in the last few Munich matches we can see they always concede and that shows that they have problems in their defense. The match against Leipzig also almost ended in a draw and they had few shots on target. But Harry Kane was able to use the opportunity to score a goal to win Munich. I think I predict Lazio will go through to the next round.