Indeed, This season is very different from the previous. The dominance of Bayern is really declining, moreover during these matches. Bayern could play amazingly in UCL, but they couldn't perform optimally in the Bundesliga. So far, only Union Berlin can perform quite consistently among all clubs in Bundesliga.
Well at the moment the table of the Bundesliga is really looking very unfamiliar in comparison to the previous year. I would not go so far and say that the dominance of Bayern is declining already though. I mean of course they had 4 games in a row now where they did not win and they even lost the last one, but in all of those games they did not play that badly, they even played pretty good in most of them. They just were not able to score because they were so inefficient with their chances. I am pretty sure though that in a few weeks the table will look different again. Maybe Bayern will not already be on the first place again then, but they will definitely be ranked higher than they are now and pretty close to the first place.
If not, they probably have to sack Nagelsmann.