Why is the eureka tech boost for siege tactics after owning two Bombards not working?

Why is the eureka tech boost for siege tactics after owning two Bombards not working? - Woman in Red Sweater Wearing Black Framed Eyeglasses Sitting on Wheelchair

I have three bombards. The eureka requirement for Siege tactics is owning two bombards. But it has not been boosted.

I guess this is a bug. Is it know from before, and is there a workaround? Tried to reload the game from a save file, but it did not work.






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