I will continue testing this but it has not changed since it was played and reviewed from both sides in 2021 and no issues were reported
HOWEVER.
I let it play out AI vs AI and it got to the point of putting replacement on the map ( I think....) the start of turn 6 when it shut the game down and I saw a graphics symbol on the map that should not be there
HOWEVER Pt 2
I restarted the game from the Autosave and it started right up and it is now playing out in the middle of turn 6
There will be a further investigation but it appears this "issue" does not appear for everyone and it can be overcome using the Autosave