I just played a nostalgic game of the first DOS version (475.01) but i couldn't finish it, even if i conquered the world: the intelligence advisor shows one remaining enemy tribe... but it just doesn't exist. It respawned when i destroyed that colour a long time ago, but it never showed up on the map. I thought it might be a stuck settler, but i searched all the map, even with cheats, they're nowhere. I never encountered this bug before in 30 years!