I have 0 free settlers. I built a farm, naturally nobady working there. I upgrade this farm. I have free settlers, but nobody working the level 2 farm.
see the attachment.
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I have 0 free settlers. I built a farm, naturally nobady working there. I upgrade this farm. I have free settlers, but nobody working the level 2 farm.
see the attachment.
After 2 hours, the settler begin working. :D
This is a known bug that has been in the game for at least a year. The building does work, it just does not show there is a settler in it if you upgrade the building while you have no settlers available.