https://discord.com/channels/1061675558347489343/1069662191726370827/1072393358925889598

No idea why this happens. Do we not pull from the furnace properly with our setItem call?

This is fixed for all versions except the old 1.16.1 beta (that was a one-off thing, so it's discontinued and I'm not patching it).

Long story short, we aren't marking things dirty after we take items from them.

This has to be backported to 1.16