When control middle-clicking furnaces, smokers and blast-furnaces while they are smelting they do not appear to be cooking visually (not lighting up).;
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That isn't well written. Do you refer to an "inventory sprite" or to the block itself placed on the world?

If it is the inventory sprite, it works as intended. Sprites for every block state were eliminated and replaced with NBT tags, so if you go yo your inventory and put your cursor over the item, there should be on purple letters (+ NBT).

That Tag implies that the state, and items if it is a container, is retained. So, if you put that furnace, it still has the elements inside.

Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-48453, which is a report that has not been resolved yet.
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