When a Hopper is used to take finished items out of a Furnace, the experience from smelting is lost. I checked the GUIs of the furnace, the hopper and the output chest and didn't find the XP. I also tried disconnecting the output hopper and smelting a new item, and only got the XP from the new item.
MC-11978
experience loss when a hopper empties a furnace.
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Duplicate
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Duplicate of MC-7046, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.