Bugs related to key generators (why is that?).

yes, that's exactly it – I didn't install anything. I played for about two hours – as always – and then something started happening. And in general, everything was as usual. The computer is... I don't know, maybe 12 years old, and Heroes has always been installed on it since I bought it, and there were no problems. Well, in short, the strangest thing about these bugs is that they disappeared – just as inexplicably as they appeared.
However, the question remains.