Acacia Wood and Dark Oak Wood do not smelt into Charcoal in the Furnace. It does not depend which fuel you use.
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Duplicate of MC-36410 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Sorry, duplicate bug report. See MC-36620 ticket for same issue.