Some could be concerned about Bayern conceding 2 goals from such a low-rated team, but they did play with a heavily rotated squad, so I don't think that's much to be concerned about.
This seems similar to the Man United match. Bayern Munich managed to win by a narrow margin, while Man United failed to advance to the next stage. The results of these two matches should serve as a lesson for the big teams. They cannot underestimate smaller teams and assume that they will be easy to beat. The fact is, the ball is always round. Anything can happen before the final whistle blows. Coaches must carefully consider their player selections, even when facing teams far below the top league level.