You are right that Bayern Munich often surprises in the Champions League when they turn things around for that I'm pretty sure they will do it again. Even though Lazio has the capital to win in the first leg, by visiting Bayern munich headquarters, of course they will have a lot of pressure in the match. Bayern munich certainly has quite a lot of experience in the Champions League and in the second leg they will play better in their search for victory.
Allianz Arena is always a scary stadium when it comes to Champions League competition, Bayern Munich is known for scoring the hight goals in Champions League matches even if they lose the first leg, they use to score more than eight goals both home and away when they are in good form; nevertheless, this time is not exempted even though they they are not in good form, but I doubt if Lazio will eliminate Bayern Munich at this stage.
From Tuchel performance in the Champions League, he has a good record, but I hope he can do it again with Bayern munich this season. Has many quality players in the team and also a striker who is quite productive in scoring goals so what Tuchel has to do is set a better strategy for their progress in the second leg. I predict that maybe Bayern munich can score 2 goals or more in the second leg.
His performances in the past were like fluke, he us a lucky coach I must admit back then when he have all these records, but for him to fail to take Bayern Munich to the top of the Bundesliga table is something to be concerned about, he is not a good manager as people are expecting that is why he was sacked by Chelsea management.
Not withstanding, he can do something this time since the goal is not much, the players will put effort to make it happen because it will be a shameful thing if Lazio eliminates Bayern Munich.