Factorio Forums

As far as I can tell, the Worker Robot Cargo Size research doesn't allow construction bots to carry multiple items to build at once.

That's currently by design.

There's no CPU friendly way to find "near" jobs that a robot might be able to do and the internal structure of construction robots doesn't allow them to have more than 1 construction target at a time as it is now.

That may change in the future but for now that's not a bug.

Alright. I halfway suspected that it might be intentional. It might be worth adding a note to the research description about this to save others confusion.