B. Munich has been having problems with scoring goals for a few games but i don't think it's permanent. It is normal to have problems in scoring goals after Lewa but i believe that this problem will disappear after two or three weeks. B. Munich started this match with a big rotation in addition. I think the reason for this is that they want to focus on the champions league as well. There are also problems with the defense. Nagelsman could be kicked off the team if it goes like this. He has Lewa allowed the sale and did not take a forward.
It is not possible that they can have permanent scoring problems, they will of course score goals, i don't even think they have any scoring problems because they scored in each of their last three games in which they drew, maybe they should have scored more in those games in order to win, but they did not end the match without scoring. Naggelsman is not under threat of being fired, they can still have a very successful season, he just needs to bring the focus back into his team and start winning again, he wasn't also the one who sold Lewandowski, the Polish striker wanted to go, and the club allowed him to, the manager is not in charge of transfers, whether players leaving, or coming in.