I played a game with the menu option "Missionaries and Executives start automated" and I noticed that two of my executives where airlifted to the same city. This happened after my two cities auto-building Mining Inc Executives spreaded the corporation to all my cities in the continent.
The bug seems to be in function bool CvUnitAI::AI_spreadCorporationAirlift(). When two or more cities are building executives that can only spread corporation by airlifting, this function chooses always the same city (until the corporation is spreaded into it). I think this can be fixed by checking that there's no executive of the same type present in a city before the airlift.
Same behaviour happens with bool CvUnitAI::AI_spreadReligionAirlift().
A fix for this bug in bool CvUnitAI::AI_spreadReligionAirlift() could be:
The bug seems to be in function bool CvUnitAI::AI_spreadCorporationAirlift(). When two or more cities are building executives that can only spread corporation by airlifting, this function chooses always the same city (until the corporation is spreaded into it). I think this can be fixed by checking that there's no executive of the same type present in a city before the airlift.
Same behaviour happens with bool CvUnitAI::AI_spreadReligionAirlift().
A fix for this bug in bool CvUnitAI::AI_spreadReligionAirlift() could be:
Spoiler :
