https://1drv.ms/u/s!AijRSnVRY4C4n3tabfjXSoG5xFbf?e=QyYJKw
I put it in my one drive shared folder, you should have access to download this (unless you have another option to send the file. then feel free to share that and i'll upload it there)
after playing around for awhile, I noticed that if I come at different angles they sometimes start to work, though sometimes they dont. its very finicky. though this didnt start to happen until I had 2 rows of turrets and 2 tile thick walls and the wall teeth. some areas where I only had the basic defense dont have this issue. (this is the 1 thick wall and 1 row of turrets.
though now they dont have issues with building new blueprints, there was a time where they wouldn't come out even if I had all the materials. some times it still happens but rarely now.
I think it has something to do with the drone's updating it's pathing or something. or maybe they're stuck on a task that they cant get to? because I've noticed sometimes where I would stand still in a specific spot (like right up to the wall between the wall and turrets) they wouldn't do anything but when I start to manually repair the walls, they suddenly come alive and start repairing but only in a very small location.
in the save I provided I am currently doing repairs on my walls, if you move along the wall, you should be able to see what I mean.