Yes, this happens quite often (deterioration of results after a major important victory), but in my opinion this is not the case. Usually this happens after a big victory over a roughly equal opponent, but Salzburg is difficult to recognize as such. I think after such a victory Bayern will relax psychologically and the next match will also win easily and big, so the bet in this game is profitable.
Hoffenheim was able to draw the match. Hoffenheim played defensively after scoring the first goal. Bayern Munich's players have not been able to score full points in the match despite a lot of attacks. However, Bayern Munich lost points again. Dortmund now have a good chance to close the gap with Bayern Munich. Let's see if Dortmund can bridge the gap.