Yes, I remember when Bayern lost away to Feyenoord with a big score, but made a crazy amount of attacks, but could not score a goal... But Bayern at home is a completely different team, in Munich it is very difficult for any club to play against the hosts... I think that Inter will definitely have difficulties to at least draw in the first leg...
Inter have shown in recent seasons that they cannot be underestimated and that they take the Champions League very seriously. But Bayern are recovering this season, they can play very well in some matches, but sometimes they can lose even with total dominance, as was the case with Aston Villa, or even with weaker teams in the Bundesliga they also sometimes lost points and were almost helpless, as was the case in the match with Mainz. Inter is much more stable, this can be significant, equal teams, here I can not single out a favorite.