Follow-up Comment #3, bug #18816 (project freeciv):
This is the experimental ruleset on S2_3.
I conquered a Spanish city, so i gained the Genetic Engineering.
But in the same turn, previously I also conquered another Spanish city and
this give me The Corporation.
So i did have cities producing caravans instead of freights...
So when forget_tech_transfered() was called it encountered cities producing
caravans which now it can't build...
So, instead of upgrading those caravan units to freights, it just removed and
begin building airports....
And, yes, it seams similar to bug #18736.
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