Many players complain that they can't plow 3*3
I'm too, but I think the reason is: 'Hire to plow' don't need to check the number of neighbor. But it also
disable the Acclaimed Neighbor trophy, which
allow us to plow 9 fields without having 3*3 plower.
When 3*3 plower was introduced, I (and many players) don't need to buy it, because of having Acclaimed Neighbor trophy. So now we can't plow 9 fields, we check the storage and realize 3*3 plower disappear. Actually, we haven't bought it before!
It doesn't disappear, because it doesn't exist before this update release.
PS. I have just plower 4 fields, the result is unable to plow, too. So, I believe my predict is correct.
This bug related to devs remove neighbor check