@Atrik I think my repeated second quote from the second paragraph may have caused some confusion, but if I understood correctly, their response was referring to my suggestion of using “order one unit” when building a house with civilians who are already farming.
You are right. I was wrong about this
Civilians don't actually farm on fields unless building the farm was part of their order queue so I don't know what this discussion is about.
They might build the unfinished field, but they won't farm it. They will look for another thing to build OR go idle.