Although maybe you have doubts about Bayern due to Bayern's recent inconsistency. But you also have to be more doubtful about Lazio which is much worse than Bayern this season. In serie a Last season Lazio managed to finish in 2nd place in Serie A. But this season Lazio is still rotating in a ranking closer to 10th and is having difficulty getting closer. 4th place. But still, Bayern won't be able to beat Lazio easily. Lazio could even surprise Bayern in the second leg. But in actual analysis, Bayern should be able to qualify from the round of 16 this season. Because actually Lazio is not as strong as them. It's just that Lazio has a careful game and rarely makes gaps for big matches.
Bayern Munich is decreasing their performance in Bundesliga but they look strong enough in UCL. If we learn the stats of Bayern Munich in UCL so far, they still never got a lose during the group stage. Meanwhile Lazio, they already got 2 defeats during the group stage. Bayern just got a defeat in the last match against Lazio. But it is still Leg 1, there is Leg 2 in March 6. And the Leg 1 was held in Lazio home, the Leg 2 will be held in Bayern home. I'm very sure that Bayern Munich will have an extra motivation to win in Leg 2. Sure, Lazio isn't impossible to surprise us. However, I still believe that Bayern Munich will win Leg 2 with 2 goals at least. And they will try to improve their defense, so they will minimize the chance for conceded goals.