Transferring coal to furnaces has a 1 in 3 chance of crashing,
Specifically coal and to furnaces. No other fuel source or container.
https://pastebin.com/Ct5GWmLN

Same, I transfered a spruce plank into a furance and crashed. I'm playing on the "[Fabric 1.20] v0.9.2" version. https://pastebin.com/6SX4LL4E

I've had the same issue, but with transferring a single spruce plank into a furnace.
https://pastebin.com/A3NmakTi

If I can add on this:

This bug occurs whenever you try to move an item to a container, but the same item gets used up or transfered almost immediatly. So the same happens when putting something into a container with a hopper under it, or a hopper connected to a container, and anything else where the item is basically almost immediatly removed again after putting it inside. (This also causes a bug with some other mods like EasierVillagerTrading, due to the nature of the items being moved too quickly)

Thank you for your efforts and bug testing, this should be fixed now and mods like EasierVillagerTrading should work too, at least they do for me :D
Maybe you could give feedback on this

Been waiting for 2 months for this fix, thank you for the update!