I played with this mod for about 3 hours last night. Whenever a drone would have pathing issues or get stuck on my belts, I would try to pick them up. It takes so long to mine them that occasionally they would run out from beneath my cursor and I'd try to mine a belt, which would reset the progress for picking up the drone.
I can also see this being an issue late game when you get real construction robots if you want to convert away from construction drones. I propose adding another building to the game or changing the existing beacon to behave more like roboports. Having a place for the drones to go which would also allow me to pick them up out of an inventory would be really nice.