[...] but isn't clear, why.
I don't know why, and I don't *beep* care to be honest. I said this earlier many times before:
- if you fiddle with the game/save game in any way other than planned, expect the unexpected
- if you bork up your game by editing/cheating, don't blame it on the devs ("there's a bug in your game...")
- if you want to cheat, always have a fallback strategy (unedited save games, clean game install etc.)
In any case: there's absolutely no need to cheat in this game at all. You don't get any benefits from cheating, it's quite the opposite: you'll probably screw up a fantastic game and get frustrated.
And once again: I tried to help several people here who said there are "bugs" in this game by checking their save games -- and it turns out *all of them* cheated. So, if you still believe there are bugs, prove me wrong: send me your save game via direct message, describe your bug and I'll have a look!