How to reproduce (in creative):
place smelter
Fill with fuel and smeltable item
Place it in inventory using Ctrl+mmb
Place down.
The smelter still works, but it doesn't show flames nor particles. F3 screen also shows it as ''lit: flase''
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-48453.
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