boskid wrote: Fri Jul 31, 2026 8:06 pm It is now fixed for 2.1.13.

Hey awesome thanks that was super quick ha ha! I was actually just coming here to report that I actually haven't been able to get it to happen again since porting this. Glad you were able to figure it out!

Some further experimentation

I tried using a new small blueprint with just four roboports and storage chests. I attempted several times using the same steps with this smaller blueprint and didn't get it to happen.

And I tried another small blueprint of four roboports with also some track and train ...

Here are attachments.

startx23 file a save before (duplication had already happened I think 5 times). Character has 15 roboports in inventory, 10 more are in a box in the base. No active production of roboports ongoing.
startx24 save after more recent duplications. Character now has 17 roboports in ...

I'm out building mines from a huge blueprint. I place down the blueprint, including rows of miners, belts, and inserters and rail and stop for the trains. It also includes four roboports to get it built. Then, I hand place one roboport and a supply chest, then fill them with the bots and materials ...