I don't think Munich was intentionally showing weakness in defense. Munich conceded two goals against Monaco. Although this was intentional, the team conceded three goals against Liverpool in the previous match. Did Munich intentionally concede a goal against Liverpool?
Munich has a lot of weaknesses in defense. This is evident from their performance. However, if Manuel Neuer was the goalkeeper, Bayern Munich might not have conceded so many goals.
In the four trial matches that Bayern Munich underwent they conceded 7 goals, no one thought this was intentional but rather a form of defense that needed to be corrected. Tuchel must also try to maximize the bottom line so that it is more optimal and solid when the League starts, although Bayern Munich's test match got maximum results and was quite satisfying. Another problem could also have an impact on the absence of Manuel Neuer which could affect the number of goals conceded by Bayern Munich.
It is reported that Bayern Munich are also in talks over a contract with the former Manchester United goalkeeper, no one knows whether this is a temporary option or not and there is no further news yet. Likewise with Harry Kane, who was the priority forward being targeted by Bayern Munich, but in the third offer Tottenham again turned him down.