I also think you were wrong to overestimate Bayern, unfortunately it happens in football.
It was probably a particularly unlucky match and this also happens in football, sometimes even if the team you face is weaker than you you end up losing, this also happens in football.
To compete in the Bundesliga, it is likely that the Bayern team is able to overcome their opponents to be able to lift the trophy this season, but I do not dare to say that it will be easy for them to get the trophy even though on paper the Bayern team is currently superior to their opponents who are below them in the Bundesliga standings, but to compete in the Champions League, the Bayern Munich team must play with better performance and not underestimate the opposing team so that they can continue to advance to the semifinals later.
Competition in the Bundesliga is not too tight Bayern Munich has always been the dominant champion in the League every season. I do not doubt Bayern Munich's appearance this season they look in good condition, Bayern Munich is superior to its opponents throughout the season even so they must have consistency not to underestimate their opponents. Bayern Munich has obstacles in the Champions League when competing with other big teams especially La Liga and the English League which are so strong Bayern Munich must develop their performance in the next match.