Well, I think this is normal. considering that Arsenal is in the Premier League and is even at the top of the current standings, even above Man City. So it is very natural to see that Arsenal will be favourites. But this season, Bayern is not even at the top of the Bundesliga. It's just that the performance of both at UCL is actually quite equal. but if i had to bet then i would choose to bet on arsenal.
Bayern Munich seems to have no enthusiasm anymore and prefers to remain in second place in the Bundesliga this season, because if you look at the difference in points between the positions of Bayer Leverkusen and Bayern Munich, there is a 10 point difference in victory.
This means that Bayern Munich must always win in the next match until this season ends. I am sure for Bayern Munich this is not easy to do, therefore I am sure they will only maintain their position in second place until this season's Bundesliga is finished.
You are right, things can sometimes get complicated even for the teams that have the most experience of everything, I have always seen Bayern as one of the best teams, however when I compare with Leverkusen things usually change because they are now second. , when in previous seasons they were somewhat bad but recovered quickly, then this means that things can be seen in a different way, Leverkusen champion of the Bundeslia, and Bayern putting all their efforts so that in the UCL they do things better , this is similar to what happened to Madrid in one season, they put all their effort into the UCL and dropped the League, where Barcelona won it, the curious thing about all this is that I believed that Bayern's main contender was Dortmund, but without a doubt Xabi's team makes the difference.