A spark of fire across blocks (see screenshot) and spread fire even with the fire covered with 2 blocks
Linked issues
is duplicated by 12
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Comments 6
It is very strange .. Smoke if something is blocked (not flammable) to copper. Well, but do not want to create discussion.
Resolution: Works As Intended
That's why.
Please don't post on year long resolved bug reports (this is from almost 4 years ago)
Fire spreads up to 4 blocks above the source.