when using the block data command if you enter a furnace data like so {CookTimeTotal:20s,CookTime:1s} then it will speed up the furnace but if you enter it were the cook time is higher than the total cook time the GUI will freak out for example: {CookTimeTotal:1s,CookTime:20s} also there is a picture of what happens to the GUI.
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Duplicates MC-80938
does this also happen without resourcepack?