What happened in the Bundesliga put the Bayern team in serious trouble and this will have an impact on the team's performance so Lazio can take advantage of this in the first leg to steal important points at home to Bayern.
The possibility of a second leg in the future is still wide open for Bayern, but I am quite pessimistic after seeing Bayern's performance at the moment, they are really not at their best and also the second leg will be played at home to Lazio so this will be very difficult. for Bayern.
Indeed, Bayern Munich this season has often appeared inconsistent, especially if you look at the Bundesliga, they will almost certainly fail to defend the Bundesliga title. Moreover, in the last match, Eteka almost drew against Leipzig. Luckily, in the final minutes, Kane saved Bayern Munich and managed to get three points.
Likewise in the UCL League, it looks like it will be difficult for Bayern Munich to win the UCL League this season with the team and internal conditions being shaky because Tuchel is rumored to be fired at the end of the season. But against Lazio I think Bayern Munich can turn things around so they can qualify for the next round, but I'm not sure they can reach the semifinals, let alone the final.