The structure seemed to be complete but the craftsman continued building and build pass 5 of of 4 started.
Additional info:
The structure was scanned in a previous version of Ancient Warfare (1.12 but can`t remember which one)
Structure builder worked as intended in the previous version (2.6.1.349)
I´m building on a local Forge server (Version: 14.23.4.2757)

could you share the structure template?

farmhouse_oak.zip
Here you go