[Dup] Workers/Villagers stop building

This is in Alpha 4.
After I set up the building: floor, wall, roof, and doors/windows, the workers will begin building the structure but after awhile they just stop and leave the build unfinished. Even when there are no other tasks they just idle as if the building was finished. Is there a solution to this?

I moved a post to an existing topic: [Con] Crafters refuse to do work