Milan lost when facing Dinamo Zagreb, how can you say that Milan won against that club in this 8th match, but even though Dinamo beat Milan, the club also could not secure itself in the play-off round, while Milan, even though they lost, remained in the play-off zone and will face clubs that entered the knockout round qualification to determine which clubs will advance to the last 16.
Maybe Milan already knows and realizes more carefully that even if they lose in the eighth match they will still qualify for the play-off round and the one who beats them will still go home because they did not qualify for any round in the Champions League this season, namely Dinamo Zagreb. This means that Milan is a team that is quite smart in seeing the situation so that in the away match Milan did not really bring out their best abilities in order to win at their opponent's home, while Dinamo Zagreb really had to win in order not to be embarrassed in front of their own supporters even though in the end they did not qualify for any round.
That thought could be reasonable, Milan might just want to save their energy and just play a normal match to fulfill the match, but if you look further is that possible? and honestly in this match Milan really lost because they couldn't face Dinamo Zagreb, do they have any compassion in a high level competition match like the champions league? I think it's quite impossible if we think in that direction considering that Milan also can't be predicted that this was intentional or indeed a setup if the thought you expressed is true.