Hmm I think the tactic is bugged indeed.
There are some other games here which have the same problem:
Slovensko:
(1183), m-t-m, PD: med +++, ID: inept +++, reb: med +, home
(1201), m-t-m, PD: med ++, ID inept +++, reb: inept +++, away
After those matches they always played a 2-3 zone, and their PD rating was almost always higher than when they played m-t-m. Although I think they played TIE in these matches mentioned above, still the PD increases from med ++ to average +++ or average ++ all the other matches, while the team played a 2-3 zone.