AI ignored climate instability and tried to build open farm, on next turn discovered his mistake - and tried to build ANOTHER farm, now domed one. I nationalized and closed first farm and on third turn AI decided that one farm isn't enough for him and tried to build THIRD farm (second dome farm one).
So bugs:
1) AI don't know about seasons and happily build open farms where they're able to work only 1-2 seasons per year.
2) AI is happy to build second dome farm if have enough funds - seems that AI is not checking (or failing to check) that already have one in construction.
While first one is acceptable for me (stubborn farmers!), second is leading to huge waste of private money and possible affecting not only farms now.
So now my tiny hamlet have THIS (+one nationalized & closed farm):

