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Builder's complete the top of Keeps first, causing them to float.
Parts on a Monument seems to be built in the order of cheapest first, which can also cause things like crosses on churches to float as well.

0/0 Soldiers Assigned at Lord's Manor.
I think due to using the stone core but wooden parts caused the wooden core jobs to be visible but without actual slots.

No farm field zone.
I don't know exactly how farms and farm fields work but I assume a farm will "claim" nearby farm field zones so placing a second farm near that same one will not find "unclaimed" zones to use, but I saw later that both farms were using the same field. This may be a non-issue but could cause problems later.