[2.1.8] Crash: Unstackable item has wrong value

[CaitSith2]

If you manually drag an unstackable item onto the stack that is already filled in the lab, it will correctly not stack. However, if you fast transfer or let an inserter insert the unstackable items, it will stack up to the calculated stacks needed for the speed of the lab. Attempting to save the game in this state, or just playing normally in this state eventually leads to a consistency check crash.


To reproduce this crash, load the save game, give yourself a few blank upgrade planners. Fast transfer them into any lab, then attempt to save the game.

[CaitSith2]

06-27-2026, 10-05-46.png (2.38 MiB) Viewed 300 times

[boskid]

Thanks for the report. Issue is now fixed for 2.1.9.