Bayern Munich is indeed not favored in the match because of their deteriorating performance in the league, but we also cannot rule out how Bayern Munich has a strong mentality when playing in the Champions League, so far Madrid is the most favorite team in the Champions League but isn't it not uncommon for us to see there are favorite teams that are actually eliminated by underdogs in the Champions League?
This season the Champions League is the only option for Tuchel to please Bayern Munich management and fans this season after their failure in the league and DFB Pokal, Bayern Munich's performance in the league is indeed quite bad but we can see how Munich can reach the semi-finals by beating Arsenal.

Tuchel dismissal will be carried out by Bayern Munich at the end of the season, but reportedly Bayern Munich management will consider Tuchel's future if Tuchel is able to win the Champions League this season, although it is still only limited to speculation but still Tuchel still has hopes to coach Bayern Munich next season especially so far Bayern Munich has been rejected by Alonso and also Nagelsman so maybe they will keep Tuchel if they have not obtained A decent coach at this time, besides that although the Champions League trophy does not change Bayern Munich decision to sack Tuchel,but at least the Champions League trophy makes Tuchel will not be too bad after the sacking later.