1. Don't be afraid of jinxing it – it only happened in the original versions, and even then, I'm not sure if it happened in all cities/factions. In later versions, it wasn't possible to trigger the bug.
2. I didn't encounter this bug, but I did encounter another one, I think in the last scenario of a mission – I don't remember whose army it was, during a battle, a bear stood on a bridge with one paw, and the other was hanging in the air – and the game froze.