Factorio Forums

I managed to get a red cross in an empty slot. You can see the chest on aquilo in the image below.

I don't know how exactly I ended up with this but I was in remote view and marked stacks of items for deconstruction and cancelled it again while robots interacted with the chest. I made the save right after I confirmed that other players could see the cross in the empty slot as well (1-2 minutes after its occurance at most).

Had the same bug, managed to reproduce it

I have encountered this a few times in a Local game (ie, no Multiplayer lag involved), not able to reproduce reliably. It seems like it happens when the "Deconstruction Order" for the items is canceled in the same Tick as multiple Robots are interacting with the Slot / the Stack count goes to 0.

I have never been able to reproduce in Editor Mode (Paused), or with "Tick N times". I suspect that it is something about the order in which changes are applied during a Tick?