Factorio Forums

As in title.

We have for example this inserter

When replacing for example from to , inserter obeys it's programmed rules, and gets new item from, example, assembler.

GIF and save: https://wetransfer.com/downloads/75478b ... 739/0338ef

This is because when fast replacing, the circuit network is disconnected. Because it's the last connection, the network is destroyed. When the new connection is made, a new circuit network is created and thus it will be empty for 1 tick, making your <0 condition be true.

It's a bug, but unfortunately fixing it would require quite a big refactor of the fast replace logic for circuit networks.
So I would consider it a minor known issue.

This won't happen if the inserter was connected to something else.