Пандора
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Who knows...
1. In general, a bug or error is something that contradicts the design documentation. We don't have access to that documentation.
2. In the case of a game where someone plays against someone else, the distinction between bugs and features is a matter to be resolved by a judge or by mutual agreement.
3. But simply, in relation to the described case, there are several possible interpretations. For example, the task may not have been to "kill everyone," but rather something like "dig something up," reach a certain point, etc.
Also, it's important to distinguish between different types of bugs – there are errors in the game itself, and there are errors made by the mapmaker.
So, a definitive answer would be incorrect.
Of course, I should have read the victory conditions! Capture all cities and defeat all troops. I even captured all the mines... The game remained unfinished, it continued, and victory was not meant for me(((