This will be quite a tense match because Arsenal have always failed when facing Bayern Munich in several previous meetings. But this season Arsenal's conditions are much different and their strength is also better than before. Arsenal has pressure when facing Bayern Munich because they always beat Arsenal by a large number of scores and the match taking place at Bayern Munich's home ground is also an advantage for them.
Bayern Munich is not in a stable condition in the league but we never know how they will play in the Champions League. In contrast to Arsenal who have much greater motivation because they are currently playing well in the League. I am more confident that Bayern Munich will win the match because they are playing at home with much greater motivation.
Of course this match can be called a big match, because as you said, Arsenal always fail to face Bayern Munich in every meeting, but of course all teams will definitely show their best game, and even if they lose in the previous match then I think There will definitely be changes where the aim is to get better, such as improving or retraining to be able to win against a team that is said to be strong too.
and with Arsenal currently having an improvement in their playing performance, maybe they can balance the next match, whether it is against Bayern Munich or other big teams. Yes, it's true what you said, we don't know how they will play in the Chmapions league now or in the future. Competing at home certainly has a greater level of motivation and self-confidence, but that doesn't rule out the possibility of them losing, they could lose if their game is not good, anything can happen in the match that will take place.