Even though nether gold ore and gilded blackstone have the same loot table, and nether gold ore can be smelted, in attempting to smelt gilded blackstone nothing happens.
Note: It may be a feature that you cannot smelt gilded blackstone but I don't know.
Thank you for your report!
We're actually already tracking this issue in MC-177820, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. That means that this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the [search feature|https://bugs.mojang.com/issues/
] in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki