Happens in Creative and Survival-
When you put nether quartz ore in a furnace with a fuel source, the GUI is exited and upon re-entering, there is no fuel/nether quartz ore in the furnace, although it appears on.
EDIT: It appears that when you apply a comparator to the furnace in either game mode the furnace does as described above.
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Please do not mark issues as affecting future versions, as you could not have tested them.
I have figured out the root of the problem.

Confirmed.

Screenshots attached
Duplicate of MC-8022, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.