That is correct.I almost get the sense you don't lock out your engineers from the Global AI and you set that to zero. Is that correct?
They maintain their construction order even after the project is completed! Maybe they just keep improving the infrastructure of the hex?I would think that engineers would maintain their construction order until the project under construction actually is finished or I decide to switch the orders myself.
But, as Balthagot said, the constuction order in not really necesary (this was new to me as well), so perhaps we have a little bug here but it isn't a big deal.