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This is a modded save with Py and some QoL mods. There is a consistent and reproduceable crash when taking iron ore out of a furnace.

To reproduce:
- Load save
- Open furnace next to player (should have 50 iron ore in it)
- Shift-click to remove ore from furnace
- Game crashes

Removing the ash first will allow you to remove the iron ore without crashing the game.

Quick update:

I've confirmed this is reproducible on multiple saves and different machines. It only happens when the following conditions are met:

- The furnace is completely full of ash (1k ash) and paused due to this condition
- There is fuel and enough ore in the furnace to begin a new production cycle
- The current production progress is 0%
- Enough ore is removed to prevent the furnace from being able to begin the next production cycle (in the iron ore example, bringing the ore count under 10)

Removing ash or fuel to leave this state first allows you to remove the ore without crashing.

Thanks for the report. It's now fixed for the next release.