I come to my survival and first to do is to melt cobblestone to stone and when i came back and look in furnace i look that cobblestone can`t melt and i want you to fix that bug.
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How do you mean old world. This bug is on last snapshot 18w11a. And also I use a T launcher 2.23 beta because for some reason on Mojang launcher when I come to world the FPS i running
1-2 FPS
Sounds like you opened an old world? If so this is MC-125182