There IS code in there to "// CALCULATE LEADER PROGRESS TOWARDS PROMOTION" but the last actual full campaign I played was about 1997 so IDK if the current code uses it.....
EDIT........... did find a string that mentions "LEADER PROMOTED\n" in the code but we can investigate this winter
IN THE MEANTIME ...... I know there are players who mainly play campaigns so if they have seen the "LEADER PROMOTED" message let us know
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"You are never to old to rock and roll if you are too young to die".--- What do you expect to be doing when you are 80?