Same issue on 0.17.10 from Steam. Can reproduce on a new map, with or without mods.

- New game
- Place furnace
- Alt-B - select furnace
- Escape (a few times maybe)
- Crash

It crashed the first two times I tried, but on subsequent reproductions it only hangs, so the current-log was overwritten.

How to reproduce:
Place a storage chest, and set a logistics filter
Hot-replace with a buffer chest.

Current behaviour:
The buffer chest has a 0-element request for the filtered item, which does nothing.

Expected behavior:
Not sure

Small feature request - when connecting a lab through the circuit network, it would be nice if it sent out signals on the network containing the science packs used by the current research. This will allow 'smart' setups for powering on parts of the factory on-demand for producing different type of s...